> ## Documentation Index > Fetch the complete documentation index at: https://docs.rcintell.com/llms.txt > Use this file to discover all available pages before exploring further. # List service codes assigned to a group > List HCPCS/CPT codes assigned to a single group node. Works for any of the three taxonomies: - ``service_group`` — codes joined via ``ServiceCode.service_group_id`` to the matching slug. - ``betos`` / ``rbcs`` — codes whose ``betos_code`` / ``rbcs_code`` column matches ``group_code``. When ``include_descendants=true`` and the group is a non-leaf category (e.g. BETOS "P"), the response also includes codes assigned to any leaf below it. ## OpenAPI ````yaml /docs/openapi.client.json get /v1/codes/groups/{taxonomy}/{group_code}/codes openapi: 3.1.0 info: description: >- Client API for RCIntel. Admin ingest, catalog sync, and internal audit routes are omitted. See Guides → Which API to use. summary: Multi-tenant knowledge API for healthcare revenue cycle management. title: Healthcare Knowledge Layer version: 0.1.0 servers: [] security: [] tags: - description: >- Geographic payer policy lookup (national NCD vs MAC LCD vs state). Query payer, code, state, plan_type. Each row includes geo_scope and document_version. name: policies - description: >- Payer network directory — search payers, check prior auth requirements, view filing rules, denial patterns, and appeal levels. name: payers - description: >- Resolve healthcare billing knowledge across the L1-L6 layer stack. Includes payment calculation, billing guidance, and per-layer queries. name: knowledge - description: >- CMS Fee Schedule lookups — OPPS (Addendum B / APC), DMEPOS (state-level pricing), and Clinical Lab Fee Schedule (CLFS). name: fee-schedules - description: >- NCCI (National Correct Coding Initiative) — dedicated MUE limits, PTP bundling edits, add-on code edits, and code pair validation. name: ncci - description: >- Service code intelligence — CPT/HCPCS lookup, RVU data, NCCI edits, payment calculation, implant/GUDID search, and service group classification. name: codes - description: >- Submit asynchronous AI agent jobs for code research, medical necessity, and denial resolution. Poll for results and retrieve reasoning traces. name: agents - description: >- Register and manage healthcare facilities by CCN (Medicare Provider Number). Each facility is the root entity for knowledge resolution. name: facilities - description: >- NPI Registry — live search against CMS NPPES API for provider and organization National Provider Identifiers. name: npi - description: >- OpenFDA drug product lookup by NDC. Includes product-level fields with normalized ingredient and package detail. name: drugs - description: Health checks, service metadata, and Prometheus metrics. name: system paths: /v1/codes/groups/{taxonomy}/{group_code}/codes: get: tags: - codes summary: List service codes assigned to a group description: >- List HCPCS/CPT codes assigned to a single group node. Works for any of the three taxonomies: - ``service_group`` — codes joined via ``ServiceCode.service_group_id`` to the matching slug. - ``betos`` / ``rbcs`` — codes whose ``betos_code`` / ``rbcs_code`` column matches ``group_code``. When ``include_descendants=true`` and the group is a non-leaf category (e.g. BETOS "P"), the response also includes codes assigned to any leaf below it. operationId: list_codes_in_group_v1_codes_groups__taxonomy___group_code__codes_get parameters: - description: Grouping taxonomy namespace (service_group, betos, or rbcs). in: path name: taxonomy required: true schema: title: Taxonomy type: string - description: Group identifier within the selected taxonomy. in: path name: group_code required: true schema: title: Group Code type: string - description: Pagination offset (number of records to skip). in: query name: offset required: false schema: default: 0 minimum: 0 title: Offset type: integer - description: Maximum number of records to return. in: query name: limit required: false schema: default: 100 maximum: 500 minimum: 1 title: Limit type: integer - description: >- If the group is a category node, include codes from all descendant leaves. in: query name: include_descendants required: false schema: default: true description: >- If the group is a category node, include codes from all descendant leaves. title: Include Descendants type: boolean responses: '200': content: application/json: schema: $ref: '#/components/schemas/GroupCodeListResponse' description: Successful Response '422': content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' description: Validation Error security: - APIKeyHeader: [] components: schemas: GroupCodeListResponse: description: Codes assigned to a single BETOS / RBCS / service_group node. properties: codes: items: $ref: '#/components/schemas/CodeSearchResult' title: Codes type: array group_code: title: Group Code type: string group_name: anyOf: - type: string - type: 'null' title: Group Name taxonomy: enum: - service_group - betos - rbcs title: Taxonomy type: string total: title: Total type: integer required: - taxonomy - group_code - total title: GroupCodeListResponse type: object HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' title: Detail type: array title: HTTPValidationError type: object CodeSearchResult: properties: category: anyOf: - type: string - type: 'null' title: Category code: title: Code type: string code_type: title: Code Type type: string short_description: anyOf: - type: string - type: 'null' title: Short Description required: - code - code_type title: CodeSearchResult type: object ValidationError: properties: ctx: title: Context type: object input: title: Input loc: items: anyOf: - type: string - type: integer title: Location type: array msg: title: Message type: string type: title: Error Type type: string required: - loc - msg - type title: ValidationError type: object securitySchemes: APIKeyHeader: in: header name: X-API-Key type: apiKey ````