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Compare the published Medicare service mix of Ashish Harji Kalthia, MD with clinicians in the same registry specialty: Internal Medicine · Nephrology (CMS).

GARDEN GROVE, CA · 10 milesEdit location
Within 10 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 80 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Pauline Ho, M.D.

Infectious Disease · Internal Medicine (CMS) · Placentia, 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 hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
72%Service-mix similarity~9.5 milesView profile →

Haniffa M Maznavi, M.D.

Internal Medicine (CMS) · Los Alamitos, 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 hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
59%Service-mix similarity~5.4 milesView profile →

John Ronald Gurskis, M.D.

Anesthesiology · Interventional Pain Management (CMS) · Fountain Valley, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
53%Service-mix similarity~4.9 milesView profile →

Harpreet Singh, MD

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Fountain Valley, 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 hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
52%Service-mix similarity~4.9 milesView profile →

Chin Goo Kim, M.D.

Specialty details in registry · Anaheim, 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 hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
51%Service-mix similarity~2.8 milesView profile →

Syam Prasad Vunnamadala, MD

Cardiac Surgery · Thoracic Surgery · Vascular Surgery (CMS) · Anaheim, 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 hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
49%Service-mix similarity~4.6 milesView profile →

Amer Zarka, M.D.

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Santa Ana, 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 hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
47%Service-mix similarity~7.6 milesView profile →

Lawrence Grant Waldrop, M.D.

Internal Medicine (CMS) · Los Alamitos, CA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
46%Service-mix similarity~5.4 milesView profile →

Ajit S Maniam, M.D.

Specialty details in registry · Anaheim, 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 hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
46%Service-mix similarity~4.6 milesView profile →

Bernard M. Azer, D.O.

Internal Medicine · Nephrology (CMS) · Los Alamitos, CA

Shared published services
2 shared services · view billing descriptions
  • Dialysis services, 4 or more physician visits per month (20 years or older) (90960)
  • Dialysis services, 2-3 physician visits per month (20 years or older) (90961)
44%Service-mix similarity~5.4 milesView profile →

Deanna G Cheung, M.D.

Hospitalist · Internal Medicine (CMS) · Los Alamitos, CA

Shared published services
2 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)
  • Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)
42%Service-mix similarity~5.4 milesView profile →

Janet Pan, M.D.

Hematology/Oncology · Internal Medicine (CMS) · Fountain Valley, CA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
41%Service-mix similarity~4.9 milesView 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 approximate distance 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.