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Compare the published Medicare service mix of Laya Nasrollah with clinicians in the same registry specialty: Gastroenterology · Internal Medicine (CMS).

CA · Exact areaEdit location

2024 published service data · 500 eligible profiles compared. This search reached its 500-profile comparison limit, using NPI order. Narrow the location for a more focused comparison. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Glenn David Littenberg, M.D.

Specialty details in registry · Pasadena, CA

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
75%Service-mix similarityView profile →

Jatinder S. Pruthi, M.D.

Gastroenterology (CMS) · Lancaster, CA

Shared published services
3 shared services · view billing descriptions
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • Management using the results of remote vital sign monitoring per calendar month, first 20 minutes (99457)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
74%Service-mix similarityView profile →

Thomas Vincent Aguirre, M.D.

Gastroenterology · Internal Medicine (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
72%Service-mix similarityView profile →

Micha Rojany, MD

Gastroenterology (CMS) · Sacramento, CA

Shared published services
3 shared services · view billing descriptions
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
  • Management using the results of remote vital sign monitoring per calendar month, first 20 minutes (99457)
70%Service-mix similarityView profile →

Hardeep M Singh, M.D.

Gastroenterology · Internal Medicine (CMS) · Orange, CA

Shared published services
3 shared services · view billing descriptions
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
  • Management using the results of remote vital sign monitoring per calendar month, first 20 minutes (99457)
70%Service-mix similarityView profile →

Justin M Marasigan, DO

Gastroenterology (CMS) · Oxnard, CA

Shared published services
3 shared services · view billing descriptions
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
70%Service-mix similarityView profile →

Lawrence K Chan, M.D.

Gastroenterology (CMS) · Fairfield, CA

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
70%Service-mix similarityView profile →

Kalman J Edelman, M.D.

Gastroenterology (CMS) · Pasadena, CA

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
70%Service-mix similarityView profile →

Ananthram Pottipati Reddy, M.D.

Gastroenterology · Internal Medicine (CMS) · Santee, CA

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
69%Service-mix similarityView profile →

Kenneth L Buch, MD

Gastroenterology (CMS) · Encino, CA

Shared published services
3 shared services · view billing descriptions
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
  • New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)
69%Service-mix similarityView profile →

Richard Emery Nickowitz, MD

Gastroenterology (CMS) · Pasadena, CA

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
69%Service-mix similarityView profile →

Peter M Rosenberg, M.D.

Gastroenterology (CMS) · Pasadena, CA

Shared published services
3 shared services · view billing descriptions
  • Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)
  • Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month (99439)
  • 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)
68%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.