npidexNPI registry + Medicare data

ALLISON ZHANG, MD

Gastroenterology Physician · SAN JOSE, CA

Individual Active NPI 1821435900

Medicare payment data Part B · 2024

YearBeneficiariesServicesSubmittedAllowedPaid
2024390993$1,063,437$138,957$104,574
2023288582$645,062$95,080$72,958
2022222379$419,509$69,428$52,255

Top procedures (2024)

HCPCSDescriptionServicesAvg allowedAvg paid
G2211Visit 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's203$19$15
99204New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more154$198$133
45385Removal of polyps or growths of large bowel using an endoscope with mechanical snare132$284$231
99214Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more125$154$111
45380Biopsy of large bowel using a flexible endoscope124$44$35
43239Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope83$103$78
99215Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more67$214$156
99205New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more43$261$192

Taxonomy & licensure

SpecialtyCodePrimaryLicenseState
Gastroenterology Physician207RG0100X✓A165178CA
Internal Medicine Physician207R00000XA165178CA

Medicare eligibility

Part B
Yes
DME
Yes
Home health
Yes
Power mobility
Yes
Hospice
Yes

Other Gastroenterology Physician providers in California

See all Gastroenterology Physician providers in California →

Source: NPPES (public domain) and CMS Medicare Physician & Other Practitioners data. Not affiliated with CMS, NPPES, or any government agency.