Walter Gwang-Up Park, M.D.
Gastroenterology Physician · Stanford, CA
Walter Gwang-Up Park, M.D. is a gastroenterology physician with a practice address in Stanford, California, and NPI 1538355672, issued on Sep 21, 2007. Check the license (California A88008, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Walter Gwang-Up Park
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A88008 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Sep 21, 2007
- Record last updated
- Apr 16, 2024
- Medicare enrollment
- Enrolled (PECOS I20080707000741); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 2003
- 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 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Walter Gwang-Up Park in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A88008Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average gastroenterology physician in 2024
273 Medicare Part D claims for 115 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims.
Most prescribed
- Omeprazole69 claims
- Creon55 claims
- Peg 3350-Electrolyte32 claims
- Dicyclomine Hcl12 claims
- Gabapentin12 claims
- Pertzye11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $66,462.58
13 payments; by number, the most common kind was consulting fee; the largest payer was CapsoVision, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Walter Gwang-Up Park among 2,140 gastroenterology physician records in California
Walter Gwang-Up Park, 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 2007, is newer than 52% of them.
- NPI issued2007 · 52% of these records are older, 37% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2003 · median 2002 among the 1,538 with a school on file
- Record last updated2024 · 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).
70 gastroenterology physician records list a practice address in Stanford
They are 70 of the 5,606 NPPES records with a practice address in Stanford, and 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Stanford → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Aijaz Ahmed, MDStanford, CA 943051447351747
- Ashish Atreja, MDStanford, CA 943051831152883
- Ann Chen, MDStanford, CA 943051003840307
- Shai Friedland, M.D.Stanford, CA 943051316034655
- Jeffrey Glenn, M.D., PH.D.Stanford, CA 943051366523946
- Joo Hwang, MDStanford, CA 943051194815043
- Paul Kwo, M.D.Stanford, CA 943051578527008
- Uri Ladabaum, MDStanford, CA 943051245288059
Common questions
What is Walter Gwang-Up Park, M.D.'s NPI number?
Walter Gwang-Up Park, M.D.'s National Provider Identifier (NPI) is 1538355672, issued on Sep 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Walter Gwang-Up Park, M.D. located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Walter Gwang-Up Park, M.D.'s license?
NPPES lists California license number A88008, 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 Walter Gwang-Up Park, M.D. prescribe under Medicare Part D?
In 2024, Walter Gwang-Up Park, M.D. had 273 Medicare Part D claims for 115 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Walter Gwang-Up Park, M.D.'s MIPS final score?
The 2023 MIPS final score is 76.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.