Jay Guan, M.D.
Gastroenterology Physician · Los Angeles, CA
Jay Guan, M.D. is a gastroenterology physician with a practice address in Los Angeles, California, and NPI 1295122497, issued on Apr 25, 2015. Check the license (California A144843, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jay Guan
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A144843 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 N State Street, CT-A7D, Los Angeles, CA 90033
- Phone
- (323) 226-7556
- Enumerated
- Apr 25, 2015
- Record last updated
- Apr 9, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (323) 226-2657
- Medicaid ID
- JG3232267556 CA
- Medicare enrollment
- Enrolled (PECOS I20210609001056); 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 1200 N State Street, CT-A7D
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rahel Demisse, M.D.Hematology & Oncology Physician1124462486
- Linus LiuStudent in an Organized Health Care Education/Training Program1700230307
Verify Jay Guan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A144843Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average gastroenterology physician in 2024
1,813 Medicare Part D claims for 419 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims. 11 claims were for opioids.
Most prescribed
- Omeprazole309 claims
- Pantoprazole Sodium179 claims
- Linzess98 claims
- Mirtazapine68 claims
- Rabeprazole Sodium55 claims
- Colesevelam Hcl49 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 MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $2,787.15
130 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
Bills Medicare through one group practice
- Genesis Healthcare Partners PCOxnard, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jay Guan among 2,140 gastroenterology physician records in California
Jay Guan, 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 2015, is newer than 85% of them.
- NPI issued2015 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2015 · median 2002 among the 1,538 with a school on file
- Record last updated2018 · 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 Los Angeles → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Ethelred Carter, M.D.Los Angeles, CA 900331336247964
- Laurie Deleve, M.D.Los Angeles, CA 900331407882947
- Andrew Ippoliti, M.D.Los Angeles, CA 900331881621308
- Rome Jutabha, M.D.Los Angeles, CA 900331790785434
- John Kim, M.D.Los Angeles, CA 900331467676460
- Michael Kline, M.D.Los Angeles, CA 900331720017338
- Karen Lindsay, M.D.Los Angeles, CA 900331295765857
- Shelly Lu, M.D.Los Angeles, CA 900331386673606
Common questions
What is Jay Guan, M.D.'s NPI number?
Jay Guan, M.D.'s National Provider Identifier (NPI) is 1295122497, issued on Apr 25, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Jay Guan, M.D. located?
The NPPES record lists a practice address at 1200 N State Street, CT-A7D, Los Angeles, CA, 90033. Phone: (323) 226-7556. Providers update this record themselves, so call before visiting.
How can I verify Jay Guan, M.D.'s license?
NPPES lists California license number A144843, 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 Jay Guan, M.D. prescribe under Medicare Part D?
In 2024, Jay Guan, M.D. had 1,813 Medicare Part D claims for 419 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Jay Guan, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100. 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.