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Compare the published Medicare service mix of Theresa Thanh Ngoc Nguyen, M.D. with clinicians in the same registry specialty: Internal Medicine.

SANTA ANA, CA · Exact areaEdit location

2024 published service data · 27 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Thai Dinh Nguyen, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)
86%Service-mix similarityView profile →

Jane Diana Curtis, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Administration of influenza virus vaccine (G0008)
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
55%Service-mix similarityView profile →

Pelma Tabrizi, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Injection of drug or substance under skin or into muscle (96372)
53%Service-mix similarityView profile →

Hung-Min Sung, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Advance care planning, first 30 minutes (99497)
49%Service-mix similarityView profile →

Kelvin Mai, DO

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Administration of influenza virus vaccine (G0008)
48%Service-mix similarityView profile →

Huu Nguyen, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Advance care planning, first 30 minutes (99497)
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
48%Service-mix similarityView profile →

Frank Badin, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Insertion of needle into vein for collection of blood sample (36415)
  • Administration of influenza virus vaccine (G0008)
47%Service-mix similarityView profile →

Alan C Schwartz, MD

Internal Medicine · Santa Ana, CA

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
45%Service-mix similarityView profile →

Archana P Shah, MD

Internal Medicine · Santa Ana, CA

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
45%Service-mix similarityView profile →

Meena Kumari Meka, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Insertion of needle into vein for collection of blood sample (36415)
  • Advance care planning, first 30 minutes (99497)
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
42%Service-mix similarityView profile →

Ajay G Meka, M.D.

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Advance care planning, first 30 minutes (99497)
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
40%Service-mix similarityView profile →

Duc Nguyen, MD

Internal Medicine · Santa Ana, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Administration of influenza virus vaccine (G0008)
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
38%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.