Dr. Guy A. Weiss, MD
- Medicare services, 2024
- 876
- Medicare patients, 2024
- 407
- Part D claims, 2024
- 547
- MIPS score, 2024
- 88
- Hospital affiliations
- 2
- Practice address
- 200 Medical Plz, Los Angeles, CA 90024
- Practice phone
- Call (310) 794-9206
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Peter Morton UCLA Medical Building
Los Angeles, California
Find Dr. Weiss' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Guy A. Weiss is a gastroenterologist in Los Angeles, California
Dr. Weiss practices at Peter Morton UCLA Medical Building in Los Angeles, California.
Dr. Weiss' NPI, 1598084030, was assigned on May 24, 2010. Dr. Weiss holds California license A125480.
- NPI
- 1598084030NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8426340373
- NPI enumeration date
- May 24, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (310) 794-9206
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 42
- Medical school graduation
- 2010
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Guy A. Weiss practices at Peter Morton UCLA Medical Building in Los Angeles, California
Dr. Weiss' primary practice is Peter Morton UCLA Medical Building, at 200 Medical Plz, Los Angeles, CA 90024 in Los Angeles County. The practice phone is (310) 794-9206.
- Peter Morton UCLA Medical Building200 Medical Plz, Los Angeles, CA 90024 · Los Angeles CountyPhone(310) 794-9206
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Guy A. Weiss is affiliated with 4 sites of care and 1 medical group
Dr. Weiss' primary practice is Peter Morton UCLA Medical Building in Los Angeles, California. Dr. Weiss is also affiliated with Ronald Reagan UCLA Medical Center. The medical group on file is UCLA Medical Group. Dmand AI also links Dr. Weiss to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Guy A. Weiss' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Weiss practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Peter Morton UCLA Medical Building | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Guy A. Weiss is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Weiss' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Weiss is licensed in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Weiss
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Guy A. Weiss billed Medicare for 876 services in 2024
CMS data shows 876 Medicare services from Dr. Weiss across 16 procedure codes in 2024, for 407 Medicare patients. Medicare paid $79,001 for them.
Dr. Weiss' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3762024: 42513%
- Surgery
- 2023: 1762024: 24539%
- Other services
- 2023: 02024: 206
Where Dr. Weiss' Medicare services took place, 2024
- In an office48055%
- In a facility39645%
Dr. Weiss compared with the California median for gastroenterologists, 2024
- Dr. Weiss
- California median
- Medicare services
- 876vs 58649% above
- Medicare patients
- 407vs 30235% above
- Part D claims
- 431vs 38013% above
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Weiss' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Guy A. Weiss treated 407 Medicare patients in 2024, average age 71
CMS counts 407 Medicare patients who saw Dr. Weiss in 2024. The largest group is 65 to 74, with 191 patients. 75% of them have high cholesterol, and 70% have high blood pressure. 38% are also on Medicaid. Their average risk score is 2.31, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Weiss' median patient age at 55, with 57% women.
Dr. Weiss' Medicare patients by age, 2024
Dr. Weiss' Medicare patients by sex, 2024
- Women22756%
- Men18044%
Chronic conditions among Dr. Weiss' Medicare patients, 2024
- High cholesterol75%
- High blood pressure70%
- Arthritis58%
- Ischemic heart disease43%
- Mood disorders40%
- Anxiety37%
- Depression36%
- Diabetes35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Weiss' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Guy A. Weiss wrote 547 Medicare Part D claims in 2024
In 2024, Dr. Weiss wrote 547 Medicare Part D claims for 174 patients. 60% of them were for generic drugs. CMS names the drug for 431 of them, across 12 drugs with 11 or more claims each, at $184,325 in total drug cost. In 2023, CMS named 433 claims across 9 drugs.
Dr. Weiss' Part D claims by kind of drug, 2024
- Generic326 claims60%
- Brand-name221 claims40%
Dr. Weiss' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Weiss' Part D claims, 2024
- Antibiotics5%27 of 547 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4332024: 431No change
Drugs named by CMS: 12 in 2024, 9 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Guy A. Weiss scored 88 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Dr. Weiss for performance year 2024, reported as part of a group. Dr. Weiss accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Weiss as offering telehealth. CMS counts 115 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Weiss, more than 79% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Weiss' MIPS scores, performance year 2024
- 88of 100Final score
- 79.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 74of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Weiss ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 79th percentile115 procedures
- Colonoscopy
- 64th percentile51 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Guy A. Weiss received $8,367 in industry payments from 2018 to 2025
CMS Open Payments shows 48 general payments to Dr. Weiss from 8 drug and device companies from 2018 to 2025. Consulting fees make up the largest share, 85% of the total. Regeneron Pharmaceuticals, Inc. paid the most, $3,986.
General payments to Dr. Weiss by program year, 2018 to 2025
General payments to Dr. Weiss by kind, 2018 to 2025
- Consulting fees$7,07185%
- Food and beverage$1,29615%
Companies that paid Dr. Weiss the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Guy A. Weiss's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Guy A. Weiss
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Guy A. Weiss' NPI number?
Dr. Guy A. Weiss' NPI number is 1598084030. It was assigned on May 24, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Guy A. Weiss?
Dr. Guy A. Weiss is a gastroenterologist in Los Angeles, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Guy A. Weiss practice?
Dr. Weiss practices at 200 Medical Plz, Los Angeles, CA 90024. Dr. Weiss' primary practice is Peter Morton UCLA Medical Building in Los Angeles, California. Dmand AI also links Dr. Weiss to 1 hospital and 1 group practice or clinic.
What is Dr. Guy A. Weiss' office phone number?
The practice phone on file for Dr. Weiss is (310) 794-9206.
What is Dr. Guy A. Weiss' medical license number?
Dr. Weiss holds California license A125480.
Which hospitals is Dr. Guy A. Weiss affiliated with?
Dr. Weiss is affiliated with Ronald Reagan UCLA Medical Center. Dmand AI links Dr. Weiss to 1 more hospital.
What medical group is Dr. Guy A. Weiss part of?
Dr. Weiss is linked to UCLA Medical Group.
Does Dr. Guy A. Weiss accept Medicare?
Yes. CMS data shows Dr. Weiss billed Medicare for 876 services in 2024, and Dr. Weiss accepts Medicare assignment.
Does Dr. Guy A. Weiss offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Weiss as offering telehealth services.
What is Dr. Guy A. Weiss' MIPS score?
Dr. Weiss' MIPS final score for performance year 2024 is 88 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Guy A. Weiss see?
CMS counts 407 Medicare patients who saw Dr. Weiss in 2024, with an average age of 71.
What services does Dr. Guy A. Weiss bill to Medicare?
In 2024, Dr. Weiss' most billed Medicare services were medicare service (G2211), office visit, new patient (99204) and surgery: digestive system (43239).
What drugs does Dr. Guy A. Weiss prescribe most?
In 2024 Medicare Part D data, Dr. Weiss' most prescribed drugs by claims were Linzess, Gavilyte-C and Motegrity.
Has Dr. Guy A. Weiss received payments from drug or device companies?
CMS Open Payments shows $8,367 in general payments to Dr. Weiss from 8 companies from 2018 to 2025. The largest total came from Regeneron Pharmaceuticals, Inc.
How long has Dr. Guy A. Weiss been practicing?
Dr. Weiss graduated from medical school in 2010, 16 years ago.
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