PAMA Reporting for Clinical Laboratories: Applicable Labs and Requirements
Under PAMA, an applicable lab reports private payor rates and volumes through its TIN-level reporting entity. To be applicable, a lab bills Part B under its own NPI (or bill type 14x for hospital outreach), gets over 50% of its Medicare revenue from the CLFS and Physician Fee Schedule, and gets at least $12,500 from the CLFS.
Sound Lab Consultants (SLC) supports lab billing and compliance nationwide. This page summarizes CMS rules. It is not legal or reimbursement advice.
What is an applicable laboratory?
Under 42 CFR 414.502, an applicable laboratory:
is a laboratory as defined under CLIA (§ 493.2),
bills Medicare Part B under its own NPI, or for hospital outreach labs, on the CMS-1450 under bill type 14x,
in the data collection period, gets more than 50% of its Medicare revenues from the CLFS and the Physician Fee Schedule (the "majority of Medicare revenues" threshold), and
gets at least $12,500 in Medicare CLFS revenues in the data collection period (the "low expenditure" threshold). There are special rules for single labs that offer ADLTs.
The CMS CLFS & PAMA Reporting page says independent labs, physician office labs, and hospital outreach labs may all qualify. It explains how to run the 50% test:
Numerator: CLFS plus PFS revenues under your NPI, or the 14x bill type for hospital outreach labs.
Denominator: total Medicare revenues, which include Parts A, B, and D plus beneficiary cost-sharing.
CMS also posts quick-reference guides for POLs, hospital outreach labs, and independent labs. A lab that isn't applicable does not collect or report.
Who reports, and what is reported
Reporting entity: the TIN-level entity reports for all of its applicable labs (§ 414.504(a)).
What: for each test, the HCPCS code, each private payor rate, and the volume paid at each rate. Rates come from final paid claims during the collection period.
When: for CDLTs that aren't ADLTs, every 3 years. ADLTs report every year (§ 414.504(a)). The CMS page says the latest reporting window was May 1 to July 31, 2026, using data from January 1 to June 30, 2025, as set by Section 6226 of the Consolidated Appropriations Act, 2026.
How: through the CMS CLFS data collection system, using IDM registration, a submitter, and a certifier, plus the CLFS data reporting template and the list of applicable HCPCS codes.
Certification and penalties
Certification: the President, CEO, or CFO of the reporting entity must sign the data integrity certification. So may someone with delegated authority who reports directly to one of them (§ 414.504(d)).
Penalties: if a reporting entity fails to report, or misrepresents or omits applicable information, it may face a civil monetary penalty of up to $10,000 per day for each failure, as adjusted for inflation (§ 414.504(e)).
How reported data sets your rates
CMS calculates each test's CLFS rate as the weighted median of reported private payor rates (§ 414.507). Reported data affects what every lab is paid. See Medicare Clinical Laboratory Fee Schedule (CLFS).
PAMA reporting checklist
☐ List every NPI, and any 14x bill type, under your TIN.
☐ For each NPI, run the 50% majority-of-Medicare-revenues test for the collection period.
☐ Confirm CLFS revenues of at least $12,500 per NPI.
☐ Pull final paid claims from private payors (HCPCS, rate, volume).
☐ Validate the data against the CMS reporting template and the applicable HCPCS list.
☐ Register submitter and certifier roles in CMS IDM well before the reporting window opens.
☐ Have an authorized officer certify the submission.
☐ Keep the support for your applicable-laboratory determination and your report.
FAQs
What does PAMA stand for?
The Protecting Access to Medicare Act of 2014. It changed how Medicare sets CLFS rates.
Do physician office labs have to report?
Only if the POL is an applicable laboratory. That means billing under its own NPI and meeting both the 50% and $12,500 thresholds. Many POLs bill under the practice's NPI, so run the test for each NPI.
What is a reporting entity?
The TIN-level entity that reports for its applicable labs. CMS says the TIN entity and its labs should agree on how the reporting will be done.
When is the next PAMA reporting period?
CMS says that after the 2026 period, CDLTs follow a 3-year reporting cycle. Watch the CMS CLFS & PAMA page for official dates.
What happens if we don't report?
CMS may impose civil monetary penalties of up to $10,000 per day for each failure, as adjusted for inflation (§ 414.504(e)).
Do Medicare Advantage payments count as private payor rates?
Yes. CMS lists Medicare Advantage plans among private payors.
Get help with PAMA and lab billing
SLC's clinical lab billing services can help organize claims data and billing workflows. See also Medicare lab billing basics.
Sound Lab Consultants Mailing address: PO Box 2135, Chandler, AZ 85244