William Ang Go, M.D.
Gastroenterology Physician · Lancaster, CA
William Ang Go, M.D. is a gastroenterology physician with a practice address in Lancaster, California, and NPI 1992972715, issued on May 12, 2008. Check the license (California A62008, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Ang Go
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A62008 CA
Self-reported in NPPES; status is on the state search - Practice location
- 43112 15TH St W, Lancaster, CA 93534
- Phone
- (661) 726-2226
- Enumerated
- May 12, 2008
- Record last updated
- Nov 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080730000729); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 43112 15TH St W
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sifrido AlvarengaRegistered Respiratory Therapist1033687405
- Vardan Babayan, PHARMD.Ambulatory Care Pharmacist1215486287
- Julia Backs, CPNP-PCNurse Practitioner1184091290
Verify William Ang Go in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A62008Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% more Medicare Part D claims than the average gastroenterology physician in 2024
1,171 Medicare Part D claims for 361 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 14 claims were for opioids.
Most prescribed
- Omeprazole210 claims
- Gavilyte-C162 claims
- Famotidine117 claims
- Pantoprazole Sodium86 claims
- Sucralfate56 claims
- Lactulose55 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupPanorama City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Ang Go among 2,140 gastroenterology physician records in California
William Ang Go, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 63% of them.
- NPI issued2008 · 63% of these records are older, 31% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1991 · median 2002 among the 1,538 with a school on file
- Record last updated2021 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Lancaster → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Prithviraj Dharmaraja, M.D.Lancaster, CA 935341932111424
- Taha Hamoui, MDLancaster, CA 935341265521520
- Sethu Madhavan, MDLancaster, CA 935341194732230
- Ramanbhai Patel, M.D.Lancaster, CA 935341720006992
- Canagartnam Pathmarajah, M.D.Lancaster, CA 935341568488245
- Kumaravel Perumalsamy, M.D.Lancaster, CA 935341851484323
- Jatinder Pruthi, M.D.Lancaster, CA 935341205852985
- Gurcharn Singh, MDLancaster, CA 935341871670091
Common questions
What is William Ang Go, M.D.'s NPI number?
William Ang Go, M.D.'s National Provider Identifier (NPI) is 1992972715, issued on May 12, 2008. An NPI identifies a provider in billing; it is not a license.
Where is William Ang Go, M.D. located?
The NPPES record lists a practice address at 43112 15TH St W, Lancaster, CA, 93534. Phone: (661) 726-2226. Providers update this record themselves, so call before visiting.
How can I verify William Ang Go, M.D.'s license?
NPPES lists California license number A62008, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Ang Go, M.D. prescribe under Medicare Part D?
In 2024, William Ang Go, M.D. had 1,171 Medicare Part D claims for 361 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.