# Medicare ASC (Ambulatory Surgery Center) rates

`medicare_silver.fact_asc_addendum` · Medicare Advantage, Part D, Medicaid · status live · 462,343 rows

Medicare Ambulatory Surgery Center payment schedule (payment_rate) — the benchmark for ASC-setting surgery, a SEPARATE sibling system from OPPS. Don't substitute ASC for hospital-outpatient OPPS or vice-versa.

**Grain.** One row per (hcpcs_code, calendar_year, effective_period) -- Medicare ASC Addendum payment_rate + payment_indicator. DEEP 2001-2026. The shallow medicare_asc_rates is the deprecated recent-years mirror.

| column | type | meaning |
|---|---|---|
| calendar_year | int |  |
| hcpcs_code | string |  |
| addendum_member | string |  |
| short_descriptor | string |  |
| payment_indicator | string |  |
| payment_weight | decimal(38,18) |  |
| payment_rate | decimal(38,18) |  |
| pricer_group | string |  |
| multiple_procedure_discounting | string |  |
| pass_through_expiration | string |  |
| source_era | string |  |
| era_flag | string |  |
| source_zip_sha256 | string |  |
| source_member | string |  |
| source_row_number | bigint |  |
| ira_adjusted_copayment | decimal(38,18) |  |
| payment_amount | decimal(38,18) |  |
| asc_payment_group | string |  |
| reference_opps_payment_rate | decimal(38,18) |  |
| reference_asc_payment_rate | decimal(38,18) |  |
| dra_cap | decimal(38,18) |  |
| asc_copayment_amount | decimal(38,18) |  |
| former_asc_group | string |  |
| change_indicator | string |  |
| fully_implemented_payment_weight | decimal(38,18) |  |
| fully_implemented_payment | decimal(38,18) |  |
| first_transition_year_payment | decimal(38,18) |  |
| second_transition_year_payment_weight | decimal(38,18) |  |
| second_transition_year_payment | decimal(38,18) |  |
| third_transition_year_payment_weight | decimal(38,18) |  |
| third_transition_year_payment | decimal(38,18) |  |
| notes | string |  |
| dra_cap_flag | 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_asc_addendum WHERE ... LIMIT 100`; read `describe_data_source("medicare_silver.fact_asc_addendum")` first.