Oscar L. Chien, M.D. / Similar service patterns A DIFFERENT WAY TO EXPLORE Similar work. Compare the published Medicare service mix of Oscar L. Chien, M.D. with clinicians in the same registry specialty: Geriatric Medicine · Internal Medicine (CMS).
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2024 published service data · 217 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.
Geriatric Medicine · Internal Medicine (CMS) · Hacienda Heights, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223) Geriatric Medicine · Internal Medicine (CMS) · Downey, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223) Internal Medicine (CMS) · Los Angeles, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more (99306) Internal Medicine (CMS) · Oceanside, CA
Shared published services 3 shared services · view billing descriptions Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310) Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223) Geriatric Medicine · Internal Medicine (CMS) · Palo Alto, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310) Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more (99306) Geriatric Medicine · Internal Medicine (CMS) · Simi Valley, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310) Geriatric Medicine · Hospitalist · Internal Medicine (CMS) · Los Angeles, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223) Geriatric Medicine (CMS) · Los Angeles, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223) Family Practice · Geriatric Medicine · Internal Medicine (CMS) · Loma Linda, CA
Shared published services 3 shared services · view billing descriptions Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310) Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223) Specialty details in registry · Los Angeles, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310) Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223) Internal Medicine (CMS) · Los Angeles, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232) Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310) Geriatric Medicine · Internal Medicine (CMS) · Palo Alto, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310) Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more (99306) 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.