NPI Lookup · Medicare billing profile

William Chafin, M.D.

Rheumatology Physician · Gainesville, GA · NPI 1225122716. Below: what a registry shows, plus the 2024 Medicare billing context no registry clone carries.

Registry record (NPPES)

NPI1225122716

TypeIndividual clinician

SpecialtyRheumatology Physician

Practice address700 S Enota Dr Ne

City / State / ZIPGainesville, GA 30501

Top billed codes (2024)

J0717Injection, certolizumab pegol, 1 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered)316,401 · $1.1M

J3262Injection, tocilizumab, 1 mg104,244 · $491K

J0129Injection, abatacept, 10 mg (code may be used for medicare when drug administered under the direct supervision of a physician, not for use when drug is self administered)35,031 · $1.2M

J1602Injection, golimumab, 1 mg, for intravenous use19,740 · $178K

J1010Injection, methylprednisolone acetate, 1 mg5,320 · $543

Top 5 of 47 codes billed in 2024. Services · est. Medicare paid. The full list is one search in the app.

Reported industry relationships (2025)

Manufacturers with disclosed Open Payments records naming this provider in 2025: ABBVIE INC. · Amgen Inc. · UCB, Inc. · Novartis Pharmaceuticals Corporation · PFIZER INC. · and 15 more.

A payment record is a disclosed relationship under the Sunshine Act, not evidence this provider uses a product. Detail is in the app.

Part D prescribing (2024)

Hydroxychloroquine Sulfate1,232 claims

Methotrexate Sodium1,185 claims

Prednisone939 claims

Etanercept404 claims

Adalimumab185 claims

Top 5 drugs by Medicare Part D claim count. Drug-year lines under 11 claims are suppressed by CMS, so this understates low-volume prescribing.

This is the public slice. Year-over-year history, every code, payment detail, group affiliations, and phone numbers for William Chafin are one search in Prospect 811.

Where this data comes from. Provider identity, specialty, and practice location come from CMS's public NPPES registry (the National Plan & Provider Enumeration System), the official record of every NPI ever issued. Deactivated NPIs are excluded. Addresses are what the provider filed and can lag a move. Where a profile shows Medicare context, it comes from CMS's public utilization, Part D, and Open Payments files: traditional Medicare fee-for-service only, and CMS suppresses any provider-and-code line under 11 beneficiaries before publishing. An Open Payments record is a disclosed relationship, not evidence a clinician uses a product. Prospect 811 organizes public data; it doesn't add to or alter it. Not affiliated with or endorsed by CMS. Full detail on the data page.

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