Frequently asked questions
Short answers on how to read Nevvi's numbers. The full methodology behind every answer is on Methods & Sources.
Why is your number lower than what my all-payer tool shows?
Because it answers a different question. Nevvi reports the exact count on the federal Medicare record — verifiable to the row. Not an estimate of anything. Modeled all-payer databases project total volume across every payer statistically; those figures typically run two to four times the Medicare fee-for-service floor, with the same named providers and largely the same rank order. Same market, different denominator. How the numbers reconcile →
Can I audit a number?
Yes — every figure is a direct, unmodified read of CMS public files, and every page names the file and year it came from. If a count looks wrong, check it against the public record; we encourage it. The exact sources →
What exactly do the numbers cover?
Original Medicare (fee-for-service) Part B claims — the audited floor of a procedure market. They do not include Medicare Advantage, commercial insurance, Medicaid, or cash-pay volume, and we never estimate the part no public record covers. What the numbers mean, and their limits →
Why do some cells show "—"?
Two reasons, both disclosed where they occur: CMS suppresses any provider×code figure based on fewer than 11 beneficiaries before publication (absence means "suppressed," never zero), and volume that cannot be unambiguously attributed — a clinician registered with several groups — is shown as "—" rather than guessed. How volume is attributed to groups →
Why doesn't a group's total match the sum of its roster?
Group totals count each group's unambiguous clinicians; clinicians affiliated with more than one group are listed in every roster they belong to — marked "member of N groups" — but their volume is never split or assigned by guesswork. Their full personal volume is on their own profile page. The attribution rule →
How current is the data?
Each year shown is CMS's most recent annual release for that calendar year; there is a natural lag between a service year and its publication. The data footer on every page names the source vintage currently in service. Sources and update cadence →
Is anything AI-generated or estimated?
No figure on Nevvi is generated, estimated, or inferred by an AI model. Plain-English search uses AI for one thing only: translating your question into CPT/HCPCS codes. Every count, charge, and ranking is queried directly from CMS data. How plain-English search works →
What's free and what's paid?
Looking up one code across a state is always free, at full depth. Slicing the market — combining codes into baskets, filtering by city or specialty — is part of the paid platform.
Before you buy
What these numbers are: exact Medicare fee-for-service counts from CMS public files — disclosed, auditable, never modeled.
What they are not: all-payer market estimates. If you use modeled tools, expect their totals to run higher; the named providers and the rank order are typically consistent. Figures based on fewer than 11 beneficiaries are suppressed by CMS at the source and excluded.
A good first step: search a market you already know well — a group whose Medicare work you can verify — and check us against it.
Something else?
Get in touch — corrections and methodology questions are welcome.