VA Office of Information & Technology

block-beta
    columns 1
    A["Strategic Domain — Mission, vision, goals, measures"]
    B["Business Domain — Capabilities, processes, orgs, regulations"]
    C["Data & Information Domain — Standards, subject areas, governance"]
    D["Systems & Applications Domain — Applications, interfaces, services"]
    E["Networks & Infrastructure Domain — Hardware, platforms, delivery"]
    F["Security Domain — Cybersecurity, compliance, monitoring"]

    style A fill:#1a4480,stroke:#2491ff,color:#e8ecf1
    style B fill:#1a4480,stroke:#2491ff,color:#e8ecf1
    style C fill:#1a4480,stroke:#2491ff,color:#e8ecf1
    style D fill:#1a4480,stroke:#2491ff,color:#e8ecf1
    style E fill:#1a4480,stroke:#2491ff,color:#e8ecf1
    style F fill:#1a4480,stroke:#2491ff,color:#e8ecf1
                

graph TD
    CIO["CIO / Asst Secretary for IT"]
    CIO --> DCIO["Principal Deputy CIO"]
    CIO --> CTO["Chief Technology Officer"]
    CIO --> OIS["Office of Information Security"]
    CIO --> BF["IT Budget & Finance"]
    CIO --> SS["Office of Strategic Sourcing"]
    CIO --> PS["Office of People Science"]
    CIO --> CRR["Compliance, Risk & Remediations"]
    CIO --> AMO["Account Management Office"]
    CIO --> PE["Product Engineering · OIT-005P"]
    CIO --> SPM["Software Product Management · OIT-005S"]
    CIO --> SD["Solution Delivery · OIT-005T"]
    CIO --> IO["Infrastructure Operations · OIT-005I"]
    CIO --> EUS["End User Services · OIT-005U"]

    style CIO fill:#005ea2,stroke:#2491ff,color:#fff
    style PE fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style SPM fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style SD fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style IO fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style EUS fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style DCIO fill:#132338,stroke:#a0aec0,color:#e8ecf1
    style CTO fill:#132338,stroke:#a0aec0,color:#e8ecf1
    style OIS fill:#132338,stroke:#d16ba5,color:#e8ecf1
    style BF fill:#132338,stroke:#a0aec0,color:#e8ecf1
    style SS fill:#132338,stroke:#a0aec0,color:#e8ecf1
    style PS fill:#132338,stroke:#a0aec0,color:#e8ecf1
    style CRR fill:#132338,stroke:#a0aec0,color:#e8ecf1
    style AMO fill:#132338,stroke:#a0aec0,color:#e8ecf1
                

graph LR
    VET["Veteran"] --> SUBMIT["va.gov / 526EZ
or Paper Scan"]
    SUBMIT --> INTAKE["Benefits Intake API
(Central Mail)"]
    INTAKE --> VBMS["VBMS
(electronic claims folder)"]
    VBMS --> AICES["AICES
(AI evidence indexing)"]
    AICES --> NWQ["National Work Queue
(auto-assignment)"]
    NWQ --> RATE["Rating / Decision
(VBMS-R)"]
    RATE --> BGS["Benefits Gateway
Services"]
    BGS --> CORPDB["Corporate Database
(award data)"]
    CORPDB --> PAY["Payment
(FMS / Treasury)"]

    style VET fill:#005ea2,stroke:#2491ff,color:#fff
    style VBMS fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style AICES fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style NWQ fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style BGS fill:#1a2e47,stroke:#c49460,color:#e8ecf1
    style CORPDB fill:#1a2e47,stroke:#c49460,color:#e8ecf1
                

graph TD
    subgraph Upstream["Upstream Data Sources"]
        BGS["Benefits Gateway
Services (BGS)"]
        BIRLS["BIRLS
(beneficiary records)"]
        CORP["Corporate
Database"]
        MVI["MVI / MPI
(identity)"]
        FTI["FTI Capture
(federal tax)"]
        D2D["Digits to Digits
(data exchange)"]
    end

    subgraph Core["VBMS Core"]
        VBMS["Veterans Benefits
Management System"]
        VBMSR["VBMS-R
(ratings)"]
        AUTO["VBA Automation
Platform (AI/NLP)"]
    end

    subgraph UI["User Interfaces"]
        SEP["Stakeholder
Enterprise Portal"]
        EB["eBenefits
(→ migrating to va.gov)"]
        EVSS["EVSS
(→ migrating to Lighthouse)"]
        VAGOV["va.gov"]
    end

    subgraph Auth["Security"]
        CSS["Common Security
Services (auth)"]
    end

    Upstream --> Core
    Core --> UI
    CSS --> Core
    AUTO --> VBMS

    style VBMS fill:#005ea2,stroke:#d45a5a,color:#fff
    style AUTO fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style MVI fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style BGS fill:#1a2e47,stroke:#c49460,color:#e8ecf1
    style VAGOV fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
                

graph TD
    subgraph Identity["Identity & Correlation"]
        MPI["MPI / MVI
Master Person Index"]
        ICN["Integration Control
Number (ICN)"]
    end

    subgraph Shared["Shared Services"]
        NOTIFY["VA Notify
(email, SMS)"]
        PROFILE["VA Profile
(contact/preferences)"]
        EDM["Enterprise Document
Management"]
        ESB["VA Enterprise
Service Bus"]
    end

    subgraph Consumers["Consumer Systems"]
        V["VistA"]
        VB["VBMS"]
        VG["va.gov"]
        MHV["My HealtheVet"]
        LH["Lighthouse APIs"]
    end

    MPI --> ICN
    MPI --> V
    MPI --> VB
    MPI --> VG
    MPI --> MHV
    MPI --> LH
    ESB --> V
    ESB --> VB
    PROFILE --> VG
    NOTIFY --> VG

    style MPI fill:#005ea2,stroke:#54a8a5,color:#fff
    style ICN fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style ESB fill:#1a2e47,stroke:#c49460,color:#e8ecf1
                

graph LR
    subgraph Sources["Data Sources"]
        V130["VistA
(130 instances)"]
        OHM["Oracle Health
Millennium"]
        VBMS["VBMS"]
    end

    subgraph Warehouse["Enterprise Data"]
        CDW["Corporate Data
Warehouse (CDW)"]
        HDR["Health Data
Repository"]
        HI["HealtheIntent
(Oracle)"]
    end

    subgraph Analytics["Analytics & Research"]
        VSSC["VSSC
(operational reporting)"]
        VINCI["VINCI
(research computing)"]
        BISL["BISL
(BI dashboards)"]
    end

    subgraph Open["Open Data"]
        DG["data.va.gov"]
    end

    V130 --> CDW
    V130 --> HDR
    V130 --> HI
    OHM --> HI
    OHM --> CDW
    VBMS --> CDW
    CDW --> VSSC
    CDW --> VINCI
    CDW --> BISL
    CDW --> DG

    style CDW fill:#005ea2,stroke:#a86fa3,color:#fff
    style VINCI fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style HI fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
                

graph TD
    subgraph Veterans["Veteran / Public Access"]
        WEB["va.gov / Mobile App"]
        API["developer.va.gov
(Lighthouse)"]
    end

    subgraph CDN["Edge Layer"]
        CF["CloudFront / CDN"]
        WAF["AWS WAF /
Shield Advanced"]
    end

    subgraph VAEC["VA Enterprise Cloud (VAEC) — FedRAMP High"]
        subgraph AWS_GOV["AWS GovCloud (Primary)"]
            EKS["EKS / ECS
(containers)"]
            EC2["EC2 / Lambda"]
            RDS["RDS / Aurora
(PostgreSQL)"]
            S3["S3
(static assets)"]
        end
        subgraph AZURE["Azure Government"]
            AKS["AKS
(containers)"]
            AVM["Azure VMs"]
            ASQL["Azure SQL /
CosmosDB"]
        end
    end

    subgraph EVAL["Under Evaluation"]
        GCP["Google Cloud
Platform"]
        OCI["Oracle Cloud
Infrastructure"]
    end

    subgraph DC["On-Premise Data Centers"]
        AITC["Austin IT Center (AITC)
FMS mainframe, CDW"]
        HITC["Hines IT Center (HITC)
Disaster recovery"]
        PHIT["Philadelphia IT Center"]
    end

    subgraph Edge["Facility Edge (~1,300+ sites)"]
        VAMC["~130 VAMC
Server Rooms (VistA)"]
        RO["57 Regional Offices"]
    end

    subgraph Network["Network"]
        WAN["VA Wide Area Network"]
        TIC["TIC 3.0"]
    end

    WEB --> CF
    API --> CF
    CF --> WAF
    WAF --> VAEC
    DC --> WAN
    Edge --> WAN
    WAN --> TIC
    TIC --> VAEC

    style VAEC fill:#0d1b2a,stroke:#c49460,color:#e8ecf1
    style AWS_GOV fill:#0a1420,stroke:#c49460,color:#e8ecf1
    style AZURE fill:#0a1420,stroke:#c49460,color:#e8ecf1
    style TIC fill:#1a2e47,stroke:#d16ba5,color:#e8ecf1
    style AITC fill:#132338,stroke:#a0aec0,color:#e8ecf1
    style WAF fill:#1a2e47,stroke:#d16ba5,color:#e8ecf1
    style GCP fill:#132338,stroke:#6b7a8d,color:#a0aec0
    style OCI fill:#132338,stroke:#6b7a8d,color:#a0aec0
                

graph LR
    subgraph Consumers["API Consumers"]
        DEV["Third-Party
Developers"]
        VSO["Veteran Service
Organizations"]
        VG["va.gov /
vets-api (Rails)"]
        MOB["VA Mobile App"]
    end

    subgraph Auth["Identity Layer"]
        IDme["ID.me"]
        LGov["Login.gov"]
        OKTA["Okta
(OAuth 2.0 + OIDC)"]
    end

    subgraph Gateway["API Gateway Layer"]
        KONG["Kong Gateway
(current — nginx-based)"]
        APIGEE["Apigee / GCP
(migration target)"]
        HAP["HAProxy
(load balancer)"]
    end

    subgraph App["Application Layer"]
        VAPI["vets-api
(Ruby on Rails)"]
        LH_SVC["Lighthouse
Microservices"]
    end

    subgraph APIs["API Catalog"]
        HC["Health (FHIR R4)
Argonaut / USCDI"]
        BC["Benefits Claims"]
        BI["Benefits Intake"]
        DR["Decision Reviews"]
        FAC["Facilities"]
        VV["Veteran Verification"]
        LGY["Loan Guaranty"]
        FORMS["VA Forms"]
    end

    subgraph Backend["Backend Systems of Record"]
        VISTA2["VistA (via VIA)"]
        VBMS2["VBMS / BGS"]
        MPI2["MPI / MVI"]
        CDW2["CDW"]
        CORPDB["Corporate DB"]
        CASEFLOW["Caseflow"]
    end

    Consumers --> IDme
    Consumers --> LGov
    IDme --> OKTA
    LGov --> OKTA
    OKTA --> KONG
    KONG --> HAP
    APIGEE -.->|migration| HAP
    HAP --> VAPI
    HAP --> LH_SVC
    VAPI --> APIs
    LH_SVC --> APIs
    APIs --> Backend

    style KONG fill:#005ea2,stroke:#4a8fe8,color:#fff
    style APIGEE fill:#132338,stroke:#e5a000,color:#e8ecf1
    style OKTA fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style VAPI fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style HAP fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
                

timeline
    title VA Financial System Modernization
    ~2004 : CoreFLS (abandoned)
    ~2005-2014 : FLITE (abandoned)
    2016 : FMBT / iFAMS program established
    2020 : iFAMS Phase 1 deployed at NCA
    2022 : Phase 2-3 (VHA accounting)
    2024 : Phase 4-5 complete
    2027 : Enterprise deployment target
    ~2050 : End of lifecycle (~$8.6B total)
                

graph TD
    subgraph Frontend["Frontend Layer"]
        VW["vets-website
React + Redux SPA"]
        VADS["VA Design System (VADS)
design.va.gov
Web Components"]
        METAL["Metalsmith
(static site generator)"]
        MOB["VA Mobile App
(React Native)"]
    end

    subgraph Backend["Backend Layer"]
        VAPI["vets-api
Ruby on Rails"]
        PG["PostgreSQL + PostGIS"]
        REDIS["Redis
(sessions, cache)"]
        SIDEKIQ["Sidekiq
(async jobs)"]
    end

    subgraph CMS["Content Management"]
        DRUPAL["va.gov-cms
(Drupal 10.1)"]
    end

    subgraph CICD["CI/CD Pipeline"]
        JENKINS["Jenkins
(primary)"]
        GHA["GitHub Actions
(emerging)"]
    end

    subgraph Deploy["Deployment"]
        S3["S3
(static assets)"]
        NGINX["nginx
(reverse proxy)"]
    end

    subgraph Integrations["Backend Integrations (~30+ systems)"]
        LH["Lighthouse APIs"]
        MPI3["MPI / MVI"]
        ESR["Enrollment System
Redesign"]
        PPMS["Provider Profile
Mgmt System"]
        VIA2["VistA (via VIA)"]
        VBMS3["VBMS / BGS"]
        EVSS2["EVSS
(→ Lighthouse)"]
    end

    VW --> VAPI
    MOB --> VAPI
    DRUPAL --> METAL
    METAL --> S3
    VAPI --> PG
    VAPI --> REDIS
    VAPI --> SIDEKIQ
    VAPI --> Integrations
    VADS --> VW
    VW --> JENKINS
    JENKINS --> S3
    GHA -.-> S3
    S3 --> NGINX

    style VW fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style VAPI fill:#005ea2,stroke:#4a8fe8,color:#fff
    style DRUPAL fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style MOB fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style VADS fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style PG fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style REDIS fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style JENKINS fill:#132338,stroke:#a0aec0,color:#e8ecf1
                

graph TD
    subgraph Identity["Identity Pillar"]
        PIV["PIV / CAC"]
        MFA["MFA
(Login.gov, ID.me)"]
        OKTA["Okta IDaaS
(SSO broker)"]
    end

    subgraph Device["Device Pillar"]
        EDR["Endpoint Detection
& Response (EDR)"]
        MDM["Mobile Device
Management"]
        PATCH["Automated
Patch Management"]
    end

    subgraph Network["Network Pillar"]
        TIC3["TIC 3.0
(cloud-aware)"]
        ZTNA["Zero Trust
Network Access"]
        MICRO["Microsegmentation"]
    end

    subgraph App["Application Pillar"]
        SAST["Static Analysis
(SAST/DAST)"]
        ATO["Continuous ATO
(cATO)"]
        WAF["Web Application
Firewall"]
    end

    subgraph Data["Data Pillar"]
        DLP["Data Loss
Prevention"]
        ENCRYPT["Encryption
(at rest + transit)"]
        CLASSIFY["Data
Classification"]
    end

    subgraph Ops["Visibility & Monitoring"]
        SOC["VA SOC
(24/7 monitoring)"]
        SIEM["SIEM / Log
Aggregation"]
        THREAT["Threat Intel
& Hunting"]
    end

    Identity --> OKTA
    Device --> SOC
    Network --> SOC
    App --> SOC
    Data --> SOC
    OKTA --> ZTNA

    style OKTA fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style TIC3 fill:#1a2e47,stroke:#d16ba5,color:#e8ecf1
    style SOC fill:#005ea2,stroke:#d16ba5,color:#fff
    style ZTNA fill:#1a2e47,stroke:#d16ba5,color:#e8ecf1
                

graph TD
    subgraph Claims_AI["Claims Processing AI"]
        AICES["AICES
Agentic AI evidence indexing
(1B+ documents, handwriting)"]
        TERA["TERA Memo Automation
(ML prepopulation of
toxic exposure memos)"]
        PACT["PACT Act Automation
(1M+ claims processed,
~20 day advantage)"]
    end

    subgraph Health_AI["Health AI"]
        SCRIBE["Ambient AI Scribe
(launched Oct 2025,
nationwide 2026)"]
        CDSS["Clinical Decision
Support"]
    end

    subgraph Community["Community Care"]
        CCRS["CCRS
99.9% auto-adjudication
reimbursement <7 days"]
    end

    subgraph RPA["Robotic Process Automation"]
        COE["RPA Center of Excellence"]
        NINTEX["Nintex / Blue Prism
(bot fleet)"]
    end

    subgraph Platform["AI Platform"]
        VAEC_AI["VAEC AI/ML
Infrastructure"]
    end

    Claims_AI --> VAEC_AI
    Health_AI --> VAEC_AI
    Community --> VAEC_AI
    RPA --> COE

    style AICES fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style PACT fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style SCRIBE fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style CCRS fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style VAEC_AI fill:#005ea2,stroke:#e5a000,color:#fff
                

graph TD
    VET["Veteran"] --> VAMC["VA Medical Center
(determines eligibility)"]
    VAMC --> CCREQ["Community Care
Referral Request"]

    CCREQ --> R1["Region 1 — Northeast
CT DE DC ME MD MA NH
NJ NY PA RI VT VA WV"]
    CCREQ --> R2["Region 2 — Southeast
AL FL GA KY MS
NC SC TN PR VI"]
    CCREQ --> R3["Region 3 — Central
AR LA OK TX IL IN MI
MN OH WI IA KS MO NE ND SD"]
    CCREQ --> R4["Region 4 — Mountain
AZ CO ID MT
NV NM UT WY"]
    CCREQ --> R5["Region 5 — Pacific
AK CA HI OR
WA GU AS"]

    R1 --> OPTUM["Optum
(Regions 1-3)"]
    R2 --> OPTUM
    R3 --> OPTUM
    R4 --> TRIWEST["TriWest Healthcare
Alliance (Regions 4-5)"]
    R5 --> TRIWEST

    OPTUM --> PROV1["Community
Providers"]
    TRIWEST --> PROV2["Community
Providers"]

    PROV1 --> CCRS["CCRS
(Reimbursement)"]
    PROV2 --> CCRS

    style VET fill:#005ea2,stroke:#2491ff,color:#fff
    style VAMC fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style OPTUM fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style TRIWEST fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style CCRS fill:#1a2e47,stroke:#5fa86a,color:#e8ecf1
    style CCREQ fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
                

graph TD
    VISN["18 VISNs
(Integrated Service Networks)"]

    VISN --> VAMC["130+ VA Medical Centers
(by station code)"]

    VAMC --> HEALTH["Healthcare Delivery"]
    VAMC --> HOUSING["Housing Programs"]
    VAMC --> EDUCATION["Education & Training"]
    VAMC --> COUNSELING["Counseling & Readjustment"]

    HEALTH --> LH_FAC["Lighthouse Facilities API
api.va.gov/services/va_facilities/v1"]
    HEALTH --> TELEHEALTH["VA Telehealth
50+ specialties"]
    HEALTH --> MOBILE_UNITS["25 Mobile
Medical Units"]

    HOUSING --> HUDVASH["HUD-VASH
421 PHAs / 46 states
Housing Choice Vouchers"]
    HOUSING --> SSVF["SSVF
235 grantees
Rapid rehousing"]
    HOUSING --> GPD["GPD
295 grantees
Transitional housing"]

    EDUCATION --> GIBILL["GI Bill Schools
~10,000 institutions
WEAMS / GIDS API"]
    EDUCATION --> OJT["On-the-Job Training
& Apprenticeships"]

    COUNSELING --> VETCTR["300+ Vet Centers
+ Mobile Vet Centers"]

    HUDVASH --> PHA["Public Housing
Authorities"]
    HUDVASH --> CASE_MGMT["VA Case
Management"]
    SSVF --> NONPROFITS["Nonprofit
Grantees"]
    GPD --> TRANS_HOUSING["Transitional Housing
+ Service Centers"]
    VETCTR --> READJ["Readjustment Counseling
PTSD · MST · Grief
Family · Employment"]

    style VISN fill:#005ea2,stroke:#2491ff,color:#fff
    style VAMC fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style HEALTH fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style HOUSING fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style EDUCATION fill:#1a2e47,stroke:#c49460,color:#e8ecf1
    style COUNSELING fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style HUDVASH fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style SSVF fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style GPD fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style VETCTR fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style GIBILL fill:#1a2e47,stroke:#c49460,color:#e8ecf1
    style LH_FAC fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
                

graph TD
    VET["Veteran"]

    VET --> VAGOV["va.gov"]
    VET --> MHV["My HealtheVet"]
    VET --> MOBILE["VA Mobile App"]

    VAGOV --> VAPI["vets-api
(Rails)"]
    MHV --> VAPI
    MOBILE --> VAPI

    VAPI --> LH["Lighthouse
API Gateway"]
    VAPI --> MPI["MPI / MVI"]
    VAPI --> IAM["IAM / SSOe"]

    LH --> VISTA["VistA
(via VIA)"]
    LH --> VBMS["VBMS"]
    LH --> BGS["BGS"]

    VISTA --> HDR["Health Data
Repository"]
    VISTA --> CDW["Corporate Data
Warehouse"]
    VBMS --> CDW
    HDR --> CDW

    CDW --> ANALYTICS["VSSC / VINCI
Analytics"]

    VISTA --> JLV["JLV"]
    OHMIL["Oracle Health
Millennium"] --> JLV
    DOD["DoD MHS
Genesis"] --> JLV
    OHMIL --> HI["HealtheIntent"]

    STAFF["VA Staff"] --> PIV["PIV/CAC"]
    PIV --> SSOI["SSOi"]
    SSOI --> CPRS["CPRS"]
    CPRS --> VISTA

    style VET fill:#005ea2,stroke:#2491ff,color:#fff
    style STAFF fill:#005ea2,stroke:#2491ff,color:#fff
    style VAPI fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style LH fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style MPI fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style VISTA fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style VBMS fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style CDW fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style JLV fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style OHMIL fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style CPRS fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style IAM fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
                

timeline
    title VistA Evolution
    1978 : DHCP conceived
         : Onion Diagram sketched
    1979 : Underground Railroad forms
         : Ted O'Neill fired
    1981 : DHCP formally recognized
    1982 : Executive Order legitimizes DHCP
    1996 : Rebranded to VistA
    1997 : CPRS GUI released (Delphi)
         : BCMA pioneered
    2003 : WorldVistA nonprofit founded
    2006 : Harvard Innovation Award
    2011 : OSEHRA established
    2014 : VistA #1 rated EHR (Medscape)
    2016 : VistA #1 rated again
    2017 : VA decides to replace VistA
    2018 : $10B Oracle/Cerner contract
    2020 : OSEHRA ceases operations
    2024 : VistA migrated to cloud
         : VistA still at 166+ sites
                

graph LR
    REQ["Veteran/Provider
Requests Video Visit"] --> SCHED["Clinic Scheduler
Creates Appointment
(VistA VSE GUI or
Oracle Health)"]
    SCHED --> VCM["Virtual Care Manager
Generates VVC Link"]
    VCM --> EMAIL["Automated Emails
(at scheduling, 14d,
7d, 1d, day-of)"]
    EMAIL --> VET["Veteran Clicks Link
Enters Virtual
Waiting Room"]
    VET --> VISIT["Provider Launches
from VCM Dashboard"]
    VISIT --> DOC["Visit Documented
in VistA/Oracle Health"]

    style REQ fill:#005ea2,stroke:#2491ff,color:#fff
    style SCHED fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style VCM fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style EMAIL fill:#1a2e47,stroke:#c49460,color:#e8ecf1
    style VET fill:#005ea2,stroke:#2491ff,color:#fff
    style VISIT fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style DOC fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
                

graph TD
    APP["VA: Health and Benefits
(React Native / TypeScript)"]
    APP --> AUTH["OAuth 2.0 + PKCE"]
    AUTH --> IDP["Login.gov / ID.me"]
    IDP --> OKTA["Okta
(Identity Broker)"]
    OKTA --> SIS["Sign-in Service
(vets-api)"]

    APP --> PAPI["platform-api.va.gov
(vets-api endpoints)"]
    PAPI --> VAPI["vets-api
(Ruby on Rails)"]
    VAPI --> VISTA2["VistA"]
    VAPI --> VBMS2["VBMS"]
    VAPI --> BGS2["BGS"]

    APP --> LHAPI["api.va.gov
(Apigee Gateway)"]
    LHAPI --> LH2["Lighthouse APIs"]

    APP --> NOTIFY["VANotify
(Push Notifications)"]
    NOTIFY --> FCM["FCM / APNs"]

    style APP fill:#005ea2,stroke:#2491ff,color:#fff
    style VAPI fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style LH2 fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style OKTA fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style VISTA2 fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style VBMS2 fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style NOTIFY fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
                

graph TD
    CLAIM["Veteran Files Claim"] --> RO["Regional Office
Initial Rating Decision"]
    RO --> VBMS3["VBMS / BGS / CorpDB"]
    RO --> DISAGREE{"Veteran
Disagrees"}

    DISAGREE --> SC["Supplemental Claim
(New Evidence)"]
    DISAGREE --> HLR2["Higher-Level Review
(No New Evidence)"]
    DISAGREE --> NOD["Board Appeal
(Notice of Disagreement)"]

    SC --> AOJ["AOJ Re-adjudicates"]
    HLR2 --> SENIOR["Senior Reviewer
at AOJ"]

    NOD --> INTAKE["Caseflow Intake
(Matches to VBMS records)"]
    INTAKE --> DOCKET["Docket Assignment
(Direct / Evidence / Hearing)"]
    DOCKET --> ACD2["Automatic Case
Distribution (ACD)"]
    ACD2 --> VLJ["Veterans Law Judge"]
    VLJ --> ATTY["Attorney Drafts
Decision (Reader)"]
    ATTY --> REVIEW["Judge Reviews
& Signs"]
    REVIEW --> QR["Quality Review"]
    QR --> DISPATCH["Dispatch
(EndProduct in VBMS)"]

    DISPATCH --> GRANT["Grant"]
    DISPATCH --> DENY["Deny"]
    DISPATCH --> REMAND["Remand
(Back to AOJ)"]

    DENY --> CAVC["U.S. Court of Appeals
for Veterans Claims"]

    style CLAIM fill:#005ea2,stroke:#2491ff,color:#fff
    style DISAGREE fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style SC fill:#1a2e47,stroke:#5fa86a,color:#e8ecf1
    style HLR2 fill:#1a2e47,stroke:#5fa86a,color:#e8ecf1
    style NOD fill:#1a2e47,stroke:#d45a5a,color:#e8ecf1
    style INTAKE fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style VLJ fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style DISPATCH fill:#1a2e47,stroke:#c49460,color:#e8ecf1
    style GRANT fill:#1a4480,stroke:#00a91c,color:#e8ecf1
    style DENY fill:#1a4480,stroke:#d83933,color:#e8ecf1
    style REMAND fill:#1a4480,stroke:#e5a000,color:#e8ecf1
                

graph TD
    VAMC["VA Medical Center"] --> IFCAP2["IFCAP
(Procurement)"]
    VAMC --> GIP2["GIP
(Inventory)"]
    VAMC --> PHARM["VistA Pharmacy"]

    PHARM --> CMOP2["CMOP
(7 Automated
Mail Pharmacies)"]
    CMOP2 --> USPS["USPS/UPS/FedEx
→ Veteran's Home"]

    IFCAP2 --> MSPV2["MSPV Prime Vendor
(Medline, Cardinal,
McKesson)"]
    MSPV2 --> VAMC

    IFCAP2 --> DLA2["DLA Troop Support
(Philadelphia)"]
    DLA2 --> VAMC

    IFCAP2 --> FMS2["FMS/iFAMS
(Obligation Recording)"]

    NAC2["NAC (Hines, IL)
FSS Contracts"] --> MSPV2
    NAC2 --> PPV2["McKesson PPV
(Pharma Prime Vendor)"]
    PPV2 --> CMOP2
    PPV2 --> VAMC

    DLC2["Denver Logistics Center
(Hearing Aids, Prosthetics,
Telehealth Equipment)"] --> VAMC
    DLC2 --> VET2["Direct to Veteran"]

    style VAMC fill:#005ea2,stroke:#2491ff,color:#fff
    style CMOP2 fill:#1a2e47,stroke:#5fa86a,color:#e8ecf1
    style NAC2 fill:#1a2e47,stroke:#c49460,color:#e8ecf1
    style DLA2 fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style DLC2 fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style VET2 fill:#005ea2,stroke:#2491ff,color:#fff
                

graph TD
    VISTA3["VistA
(130 instances)"] --> HDR2["Health Data
Repository"]
    VISTA3 --> CDW2["Corporate Data
Warehouse"]
    ORACLE["Oracle Health
(5 sites)"] --> HI2["HealtheIntent"]

    HDR2 --> JLV2["Joint Longitudinal
Viewer (JLV)"]
    ORACLE --> JLV2
    DOD2["DoD MHS Genesis"] --> JLV2

    CDW2 --> LH3["Lighthouse
FHIR R4 API"]
    HDR2 --> LH3
    VISTA3 --> LH3

    LH3 --> DEVVA["developer.va.gov"]

    VISTA3 --> VHIE2["VHIE"]
    VHIE2 --> EHEX["eHealth Exchange
(314+ members)"]
    VHIE2 --> CW["CommonWell
(15K+ facilities)"]
    VHIE2 --> DIRECT["Direct Secure
Messaging
(483 partners)"]

    FEHRM["FEHRM
Joint HIE"] --> EHEX
    FEHRM --> CW
    FEHRM --> JLV2

    HEC["Health Eligibility
Center (Atlanta)"] --> IRS["IRS/SSA
Income Verification"]

    style VISTA3 fill:#1a2e47,stroke:#5a7fd4,color:#e8ecf1
    style ORACLE fill:#1a2e47,stroke:#e5a000,color:#e8ecf1
    style DOD2 fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style JLV2 fill:#1a2e47,stroke:#54a8a5,color:#e8ecf1
    style LH3 fill:#1a2e47,stroke:#4a8fe8,color:#e8ecf1
    style FEHRM fill:#1a2e47,stroke:#a86fa3,color:#e8ecf1
    style VHIE2 fill:#1a2e47,stroke:#5fa86a,color:#e8ecf1