CCN stands for CMS Certification Number, a unique identifier assigned to every healthcare facility that participates in Medicare or Medicaid. It’s issued by the Centers for Medicare & Medicaid Services (CMS) and serves as the primary way the federal government tracks, certifies, and communicates with hospitals, nursing homes, home health agencies, and other institutional providers. If you’ve seen a 6-digit number on a Medicare cost report or hospital certification document, that’s likely the CCN.
What the CCN Is Used For
The CCN does several jobs at once. It verifies that a facility is certified to participate in Medicare and Medicaid. CMS data systems use it to identify every provider or supplier that currently participates, or has ever participated, in those programs. It also appears on Medicare claims, cost reports, and survey and certification communications. For Part A facilities (hospitals, skilled nursing facilities, hospices, and similar institutions), the CCN is equivalent to a Provider Transaction Access Number (PTAN), the identifier used in billing transactions.
Before 2007, this same number went by other names: the Medicare Provider Number, the Medicare Identification Number, or the OSCAR Number. CMS consolidated all of those under the single term “CMS Certification Number” to reduce confusion.
How the Number Is Structured
A CCN isn’t random. Each digit carries meaning, and the structure varies depending on how the facility is paid.
6-Digit CCNs (Part A Providers)
Hospitals, skilled nursing facilities, home health agencies, and other providers paid under Medicare Part A receive a 6-digit CCN. The first two digits are a state code identifying where the provider is located. Alabama is 01, Alaska is 02, Florida is 10, and so on. Some high-population states have multiple codes: California uses 05, 55, 75, and 92, while Texas uses 45, 67, 74, and 97.
The last four digits identify the type of facility. Short-term general and specialty hospitals fall in the range 0001 through 0879. Community mental health centers use ranges like 1400 through 1499. So if you see a CCN starting with “10” and ending in a number below 0879, you’re looking at a short-term hospital in Florida.
10-Digit CCNs (Part B Suppliers)
Suppliers paid by Part B carriers, such as ambulatory surgical centers, clinical laboratories, and portable X-ray facilities, receive a longer 10-digit alphanumeric CCN. The first two digits are still the state code, but the third digit is a letter that identifies the facility type: “C” for ambulatory surgical centers, “D” for CLIA laboratories, and “X” for portable X-ray facilities. The remaining seven digits are a unique facility identifier.
Medicaid-Only Providers
Facilities that participate only in Medicaid (not Medicare) get a 6-digit alphanumeric CCN. The first two digits are the state code, the third position is a letter identifying the type and level of care, and the last three digits are a sequential number starting at 001.
CCN vs. NPI: Two Different Numbers
The CCN and the National Provider Identifier (NPI) are easy to confuse, but they serve different purposes. The NPI is a 10-digit number issued through the National Plan and Provider Enumeration System. Every healthcare provider and organization needs one for HIPAA-standard transactions, regardless of whether they participate in Medicare. The CCN, by contrast, is specific to Medicare and Medicaid certification.
A single facility often holds both. CMS recommends a one-to-one relationship between CCNs and NPIs. If a home health agency has a main location and a branch, each would typically receive its own CCN, and CMS advises obtaining a separate NPI for each one to match.
Who Assigns the CCN
The CMS Regional Office (RO) assigns CCNs, not the state survey agency or the Medicare Administrative Contractor. The Regional Office also maintains controls over the numbering system to prevent duplicates or errors.
For a new facility seeking Medicare enrollment, the CCN comes as part of a broader process. Institutional providers (hospitals, skilled nursing facilities, hospices, home health agencies) follow a separate enrollment path from individual physicians or small suppliers. The general steps involve obtaining an NPI first, then completing the Medicare enrollment application through PECOS (the online enrollment portal), and finally working with your regional Medicare Administrative Contractor to finalize the process. The CCN is assigned once CMS certifies the facility meets participation requirements.
How to Look Up a CCN
CMS maintains public tools where you can search for a facility’s CCN. The Medicare Inpatient Hospital Look-up Tool on data.cms.gov lets you search by CCN directly or by hospital name and location. This is useful if you’re verifying a provider’s certification status, cross-referencing billing information, or checking details on a cost report. Similar lookup capabilities exist for other facility types through CMS’s provider data portals.
CCN, PTAN, and TIN: Sorting Out the Acronyms
Healthcare billing involves several overlapping identifiers, and mixing them up causes real headaches. Here’s how they break down:
- CCN (CMS Certification Number): Identifies a facility’s Medicare/Medicaid certification. Used on claims, cost reports, and certification communications. For Part A facilities, this number doubles as the PTAN.
- PTAN (Provider Transaction Access Number): The number used in Medicare billing transactions. For institutional Part A providers, the PTAN and CCN are the same number. For Part B physicians and suppliers, the PTAN is a separate identifier assigned during enrollment.
- NPI (National Provider Identifier): A universal 10-digit number required for all HIPAA transactions. Not specific to Medicare.
- TIN (Tax Identification Number): The IRS-issued number (either an Employer Identification Number or Social Security Number) used for tax reporting. It identifies the business entity, not the Medicare certification.
The CCN is the one that tells CMS exactly what kind of facility you are, where you’re located, and whether you’re certified to participate. The others handle billing mechanics, universal identification, or tax reporting. When working with Medicare claims or certification documents, the CCN is typically the number that matters most for verifying a facility’s program status.