Payer Interoperability (CAQH CORE, X12, Da Vinci, WEDI)

Where this market publishes its structure

• CAQH CORE certified organizations (caqh.org/core/core-certification -> dataspring.com/core/core-certified-organizations-pending-and-current) machine-readable, 162 rows (63 health plans, 35 clearinghouse products, 19 vendor products, 44 endorsers, 1 provider); names only; 13 in-market repos linked
• HL7 Da Vinci Project members (hl7.org/about/davinci/members.cfm -> confluence.hl7.org DVP members page) machine-readable, 62 logo rows; names from alt text / hand-mapped file names (2 unidentifiable); 16 in-market repos linked
• WEDI member organizations (members.wedi.org/website-organization-directory) machine-readable, 248 members with filed website; 18 linked (3 care providers held as end users); many state Medicaid / .gov hosts held
• X12 members list (x12.org/membership/list-of-members) machine-readable, 167 organisations (individuals skipped); cross-industry: 16 in-market repos
• CMS Care Compare Home Health Care Agencies (data.cms.gov/provider-data dataset 6jpm-sxkc) machine-readable, 12,460 agencies, name + CCN, no website; 3 hand-reviewed operators linked
• CAQH CORE certified-entities page (caqh.org/core/certified-entities) not machine-readable: 404 (moved to the DataSpring page above)
• CMS Interoperability and Patient Access payer API directories not machine-readable: CMS publishes no central register of payer Patient Access / Provider Directory / Payer-to-Payer API endpoints; each payer posts its own

Own = declares at least one integration itself; covered = visible only because an aggregator, standards body, regulator or partner contract names it; distribution-only = listed only on cloud marketplaces it sells through, a channel reported beside, never counted as its own declared integrations; undeclared = nothing we can read, so no number; declares_compatibility = providers with a `compatible` shape vote, report only (kin, 2026-10-13): never counted as own, never in depth or position.

Taxonomy how this market maps onto apis.io

Derived 2026-10-23 from the 54 providers in this market we could resolve in the catalog. The percentage is the share of those providers carrying each one; it describes the market, not the tag or industry. Tag groups have no page of their own yet, so they are listed unlinked.

share of resolved cohort carrying it; tags >=0.20 & >=3 members (max 12, junk dropped), tag_groups >=0.20 (cooccurrence, non-cross-cutting; max 8), industries >=0.20 (max 6), areas >=0.10 (max 6; areas are keyword-matched and sparse), capabilities L1 >=0.20 (max 8); derive-market-taxonomy.py

Leaders by position (provisional)

Provisional: grouped by position, depth compared within a position only. Distribution (cloud marketplaces) and iPaaS bridges are counted beside position, never inside it. Unknown-builder listings are left out of position shares and counted here.

gravity 2 · other companies invest to build on it

builds-on 1 · publishes apps on other platforms' stores

regulated 5 · named in a regulator's register or partners' contracts

standard 33 · listed by a voluntary standard's own directory

mixed 1 · no single mode dominates

list 1 · a long list on its own page, mostly unevidenced

distribution 2 · only sells through cloud marketplaces

undeclared 9 · declares nothing we can read: no number