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Compare the published Medicare service mix of Patrick Armstrong, MD with clinicians in the same registry specialty: Anesthesiology.

DURHAM, NC · Exact areaEdit location

2024 published service data · 111 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Galen Alexia Royce-Nagel, M.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on urinary system through urethra (00910)
68%Service-mix similarityView profile →

Shannon Marie Page

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Injection of anesthetic agent and/or steroid into other nerve or branch (64450)
  • Anesthesia for procedure for total knee joint replacement (01402)
67%Service-mix similarityView profile →

David Brett Macleod, MD

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Injection of anesthetic agent and/or steroid into other nerve or branch (64450)
  • Anesthesia for procedure for total knee joint replacement (01402)
65%Service-mix similarityView profile →

Joshua Ryan Dooley, M.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Injection of anesthetic agent and/or steroid into other nerve or branch (64450)
  • Anesthesia for procedure for total knee joint replacement (01402)
63%Service-mix similarityView profile →

Warren Mccauley

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on urinary system through urethra (00910)
63%Service-mix similarityView profile →

Richard Daniel Runkle, M.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Injection of anesthetic agent and/or steroid into other nerve or branch (64450)
  • Anesthesia for procedure for total knee joint replacement (01402)
61%Service-mix similarityView profile →

Brian Joseph Colin, M.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
  • Anesthesia for other procedure on upper abdomen (00790)
57%Service-mix similarityView profile →

Theresa Crowgey Seay, M.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on skin of arms, legs, and front body (00400)
56%Service-mix similarityView profile →

Gary Pellom, M.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)
56%Service-mix similarityView profile →

David George Antonio Williams, M.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for other procedure on urinary system through urethra (00910)
55%Service-mix similarityView profile →

Elizabeth A Nichols, MD

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Anesthesia for procedure for total knee joint replacement (01402)
  • Anesthesia for total hip replacement (01214)
55%Service-mix similarityView profile →

William Michael Bullock, M.D., PH.D.

Anesthesiology · Durham, NC

Shared published services
3 shared services · view billing descriptions
  • Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)
  • Injection of anesthetic agent and/or steroid into other nerve or branch (64450)
  • Anesthesia for procedure for total knee joint replacement (01402)
55%Service-mix similarityView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in NPI order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.