---
id: "us_hicn"
kind: "datatype"
status: "draft"
is_pii: true
categories: ["pii", "persons", "medical"]
country: ["US"]
langs: ["en"]
quality: 95
url: "http://registry.apicrafter.io/datatype/us_hicn"
---

# US Medicare Health Insurance Claim Number (HICN) (`us_hicn`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

Former Medicare number of a beneficiary in the United States: the nine-digit Social Security number of the wage earner on whose record the person is entitled, followed by a one- or two-character beneficiary identification code such as A for the wage earner. Railroad Retirement Board beneficiaries had a differently built number. Medicare cards switched to the Medicare Beneficiary Identifier (us_mbi) from 2018, but the HICN remains in older claims and administrative files.

- Personal data (PII): yes
- Categories: Personally identifiable information (pii), Person related (persons), Medical/pharma identifiers (medical)
- Countries: United States (US)
- Languages: English (en)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^\d{9}[0-9A-Z]{1,2}$
```

## Examples

- `987654320A` — Constructed from 987-65-4320, a number that SSA reserves for advertising
- `00012345616` — Pseudo HICN example from the CMS code descriptions
- `1EG4TE5MK73` (invalid example) — An MBI, not a HICN

## Mappings

- dpv: `pd:OfficialID`
- fhir: `http://hl7.org/fhir/sid/us-medicare`

## Supported by tools

- `amazonmacie`
- `awsglue`
- `ibmknowledgecatalog`
- `nightfall`

## Sources

- doc: <https://www.cms.gov/files/document/chapter-4-code-descriptions.pdf>
- doc: <https://www.cms.gov/medicare/new-medicare-card>

## Quality

Score 95/100. Missing: translation.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/us_hicn.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/US/persons/us_hicn.yaml>