Medicare Advantage, Part D, Medicaid

CMS Basic Stand Alone sample claims: the field dictionary

medicare_silver.cms_bsa_field·live·silver

Rows

N/A

Columns

History

N/A

Card

nocolumns only

Typed tools

What it is

1The CMS Basic Stand Alone (BSA) Medicare claims public use files, the field dictionary: a 5% beneficiary sample, de-identified, 2008 to 2010.
2Claim-level and real, and old; the only claim-level Medicare data that is public.

Grain

Key	Grain
N/A	1One row per source row of the CMS BSA public use file (row_values_json carries the published columns; native_grain names the file's own grain).

Columns (27)

Column	Type	Meaning
`data_year`	int
`family`	string
`source_asset_id`	string
`source_member`	string
`source_part`	int
`field_ordinal`	int
`field_name_raw`	string
`field_name_normalized`	string
`publisher_storage`	string
`schema_era`	string
`joinability_guard`	string
`quality_flags`	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

Query it

describe_data_source(source_fqn="medicare_silver.cms_bsa_field")     # the card, live
query_substrate(sql="SELECT * FROM medicare_silver.cms_bsa_field WHERE <filter> LIMIT 100")

Item	Value
Typed tools that read it	none; raw SQL
Identity key	`source_asset_id,source_row_number`
Join	`how_to_join(source_fqn="medicare_silver.cms_bsa_field")`
Raw door	Athena (read-only via query_substrate): medicare_silver.cms_bsa_field
Note	Product lane 2026-09-28: registered from the W2 inventory. Register source cms_bsa_sample_claims (w2).

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