OASIS · Section M
M0010 — CMS Certification Number
Response options, how to score it, and the error that most often sends the record back. Cited to Ch. 1, Item M0010.
How to score it
Record the agency's 6-digit CMS Certification Number (CCN) — the Medicare provider number assigned by CMS for participation in the Home Health PPS. This is a free-text field but must match the agency's CCN on file with iQIES; mismatches cause submission rejection at the validation layer.
The common error
Entering the agency's NPI or Tax ID in place of the CCN. The CCN is a CMS-assigned identifier distinct from NPI; iQIES validates this field against the registered agency.
Source: OASIS-E2 Guidance Manual — Ch. 1, Item M0010. Verified 2026-04-26.
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