# CMS Clinical Laboratory Fee Schedule national limitation amounts, quarterly releases 2019-2026, stamped

`medicare_silver.fact_clfs_national_rate` · Medicare Advantage, Part D, Medicaid · status live · 55,116 rows

Every quarterly CLFS release since 2019 re-collected through the provenance envelope on 2026-09-07: indicator and national_limit_amount as published, modifier rows kept (the legacy medicare_clfs_rates held a single release, 2025 Q1, unmodified rows only). The 2019 files come from CMS's old Downloads path; 2023Q4 and later sit behind the AMA CPT click-through license, accepted openly with the license page kept in bronze. CPT descriptors are not stored. release = the publisher slug (e.g. 26clabq3); 20clabq2 is a publisher gap (the release page names a file CMS no longer serves).

**Grain.** One row per calendar_year x quarter x HCPCS x modifier as published; natural key (calendar_year, quarter, row_seq); 55,116 rows over 29 releases (2019Q1-2026Q3) on 2026-09-07.

| column | type | meaning |
|---|---|---|
| calendar_year | int |  |
| quarter | string |  |
| row_seq | bigint |  |
| hcpcs_code | string |  |
| modifier | string |  |
| effective_date | string |  |
| indicator | string |  |
| national_limit_amount | double |  |
| release | string |  |
| observed_period | date |  |
| asserted_at | date |  |
| effective_period_start | date |  |
| effective_period_end | date |  |
| cms_vintage_sequence | int |  |
| parse_revision | int |  |
| parser_artifact_hash | string |  |
| source_url | string |  |
| sha256_content_hash | string |  |
| source_id | string |  |
| is_current | boolean |  |
| bronze_object_key | string |  |
| s3_version_id | string |  |
| vintage_tag | string |  |
| drug_source_version_id | string |  |

Tools that read it: medicare_allowed

Query it: `query_substrate` with `SELECT ... FROM medicare_silver.fact_clfs_national_rate WHERE ... LIMIT 100`; read `describe_data_source("medicare_silver.fact_clfs_national_rate")` first.