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Nirmitee.io

Healthcare interoperability engineering — HL7 v2, FHIR R4, X12 EDI, SMART on FHIR, Mirth Connect and ABDM. Open-source tooling from production deployments.

Nirmitee.io

Healthcare interoperability engineering. We build and integrate the systems that move clinical and claims data between EHRs, payers, clearinghouses and national health exchanges.

Our team works day to day in HL7 v2, FHIR R4, X12 EDI, SMART on FHIR, Mirth Connect and ABDM. The repositories below are the parts of that work we've been able to open-source — reference implementations, test harnesses and integration recipes taken from production deployments.

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US interoperability & revenue cycle

Project What it is
fhir-prior-auth-engine FHIR-native prior-authorization workflow engine — a reference implementation of orchestration, async holds, human-in-the-loop review and event sourcing for CMS-0057 / Da Vinci (CRD · DTR · PAS). Kotlin + Spring Boot.
clearinghouse-simulator A drop-in stand-in for a real clearinghouse SFTP/EDI integration. 120 scenarios across 270/271, 278, 837, TA1/999, 277CA, 835 and 276/277, validated against a production corpus.
x12-fhir-mapper Maps X12 837/835 to FHIR R4 (Claim / ClaimResponse) through an anti-corruption layer: adapters → a neutral canonical model → FHIR. TypeScript, with a paste-and-map playground.
edi-idempotent-processor Idempotent healthcare EDI processing — make at-least-once delivery safe with the inbox + outbox pattern: dedup by ISA13, effectively-once processing, exactly-once effects. TypeScript.
openmirth-console Open-source operations layer for Mirth Connect and OIE — modern web admin, clinical observability and channel CI/CD.
mirth-connect-cookbook Production-grade Mirth Connect recipes, transformers, channels and scripts — tested in real deployments.

FHIR platforms

Project What it is
headless-ehr-fhir A headless EHR platform built on FHIR R4 — multi-tenant, HIPAA-ready, with ABAC authorization, SMART on FHIR, field-level encryption and bulk $export. Go.
EHRConnect Open-source EHR platform built on FHIR R4 — multi-tenant clinical workflows, specialty and country-specific configuration, theming and task management. TypeScript.
nirmitee-rpm Open-source Remote Patient Monitoring platform — multi-tenant workspaces, RBAC, care plans and vitals monitoring.

Security & compliance

Project What it is
hipaa-spring-boot-starter HIPAA-by-default for Spring Boot — annotate @Phi and get field-level encryption, a tamper-evident audit trail and minimum-necessary access control. HIPAA §164.312 technical safeguards as inherited platform behaviour. Kotlin.

ABDM / India Digital Health

Project What it is
abdm-v3-postman-collection Complete Postman collection for the ABDM V3 APIs — every endpoint, with sandbox and production environments.
abdm-v3-error-catalog Every ABDM V3 error code, its actual cause and the fix — in one place.
abdm-fhir-bundle-examples Production-ready FHIR R4 bundles for all six ABDM hiTypes: OPConsultation, Prescription, DiagnosticReport, DischargeSummary, ImmunizationRecord, WellnessRecord.
abdm-sdk-node TypeScript SDK for the ABDM APIs — ABHA, HIP, HIU, consent and health-information exchange.

Engineering tooling

Project What it is
integration-mock-server-template-mountebank Template for a dynamic API mock server — MongoDB-backed config, Handlebars templating, webhooks and a web UI, for testing integrations without the upstream.
health-components React + TypeScript component library for clinical UIs, styled with Tailwind CSS.

What we do commercially

  • Interoperability builds — HL7 v2, FHIR R4, X12 EDI and CCDA integrations between EHRs, payers and third-party systems.
  • Mirth Connect / OIE — channel development, migration off legacy engines, and ongoing operations.
  • Revenue cycle integration — eligibility, claims, remittance and clearinghouse connectivity.
  • EHR integration — Epic, Cerner and SMART on FHIR app launch, certification and go-live support.
  • Regulatory readiness — CMS-0057, Da Vinci IGs, ONC (g)(10) and ABDM milestone certification.

If you are building health software and hit an integration wall, get in touch.

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  1. headless-ehr-fhir headless-ehr-fhir Public

    A headless EHR platform built on FHIR R4 — multi-tenant, HIPAA-ready, with ABAC authorization, SMART on FHIR, field-level encryption, and bulk $export.

    Go 2 1

  2. openmirth-console openmirth-console Public

    Open-source operations layer for Mirth Connect and OIE — modern web admin, clinical observability, channel CI/CD.

    TypeScript 1

  3. mirth-connect-cookbook mirth-connect-cookbook Public

    Production-grade Mirth Connect recipes, transformers, channels, and scripts — tested in real deployments. Maintained by Nirmitee.io

    JavaScript 1

  4. fhir-prior-auth-engine fhir-prior-auth-engine Public

    FHIR-native prior-authorization workflow engine — a reference implementation of orchestration, async holds, human-in-the-loop review, and event sourcing for CMS-0057 / Da Vinci (CRD·DTR·PAS). Kotli...

    Kotlin

  5. clearinghouse-simulator clearinghouse-simulator Public

    X12 clearinghouse simulator — a drop-in stand-in for a real clearinghouse SFTP/EDI integration. 120 scenarios across 270/271, 278, 837, TA1/999, 277CA, 835 and 276/277, validated against a producti...

    JavaScript

  6. abdm-v3-postman-collection abdm-v3-postman-collection Public

    Complete Postman collection for ABDM V3 APIs — all endpoints, sandbox + production environments

    1

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