William Chang-Yuen Chen / Similar service patterns A DIFFERENT WAY TO EXPLORE Similar work. Compare the published Medicare service mix of William Chang-Yuen Chen with clinicians in the same registry specialty: Internal Medicine (CMS).
SAN DIEGO, CA · Exact area Edit location
2024 published service data · 67 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.
Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology · Internal Medicine (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology · Internal Medicine (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Gastroenterology · Internal Medicine (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385) Gastroenterology (CMS) · San Diego, CA
Shared published services 3 shared services · view billing descriptions Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215) Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239) Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214) 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.