John Keith Ostien, PHD
Psychologist · East Lansing, MI
Shared published services3 shared services · view billing descriptions
85%Service-mix similarityView profile →
Similar work.
More providers to explore.
Compare the published Medicare service mix of Mark B Mahacek, PSYD with clinicians in the same registry specialty: Psychologist.
MI · Exact areaEdit location
2024 published service data · 78 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.
Jessica Lauren Dluzynski, TLLP
Psychologist · Swartz Creek, MI
Shared published services3 shared services · view billing descriptions
82%Service-mix similarityView profile →
Mohamed Farrag, PHD
Psychologist · Dearborn, MI
Shared published services3 shared services · view billing descriptions
76%Service-mix similarityView profile →
Stephen J Vangel, PHD
Psychologist · Detroit, MI
Shared published services3 shared services · view billing descriptions
76%Service-mix similarityView profile →
Carol C Persad, PHD
Psychologist · Ann Arbor, MI
Shared published services3 shared services · view billing descriptions
76%Service-mix similarityView profile →
Richard Elmer James, ED. B, PH.D
Psychologist · Saint Helen, MI
Shared published services3 shared services · view billing descriptions
69%Service-mix similarityView profile →
Leon Austin, PSY.D., M.S.
Psychologist · Alma, MI
Shared published services2 shared services · view billing descriptions
62%Service-mix similarityView profile →
Patchawan Phunwutikorn, PSYD
Psychologist · Grand Blanc, MI
Shared published services3 shared services · view billing descriptions
62%Service-mix similarityView profile →
Urminda Sue Firlan, PHD, DLLP
Psychologist · Lowell, MI
Shared published services2 shared services · view billing descriptions
61%Service-mix similarityView profile →
Harold B Smith, PYS.D.
Psychologist · Berrien Springs, MI
Shared published services2 shared services · view billing descriptions
61%Service-mix similarityView profile →
Sandra K Johnson-Gamlin, PHD
Psychologist · Detroit, MI
Shared published services2 shared services · view billing descriptions
58%Service-mix similarityView profile →
David Duane Smith, PH.D.
Psychologist · Battle Creek, MI
Shared published services2 shared services · view billing descriptions
56%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.