Gregory Katz, MD
Internal Medicine Physician · Newport Beach, CA
Gregory Katz, MD is an internal medicine physician with a practice address in Newport Beach, California, and NPI 1184674178, issued on May 11, 2006. Check the license (California G76136, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Katz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G76136 CA
Self-reported in NPPES; status is on the state search - Practice location
- 520 Superior Ave, Newport Beach, CA 92663
- Phone
- (949) 642-2333
- Enumerated
- May 11, 2006
- Record last updated
- May 26, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (949) 548-9456
- Medicare enrollment
- Enrolled (PECOS I20070910000853); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 520 Superior Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Katz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G76136Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.9 times the Medicare Part D claims of the average internal medicine physician in 2024
12,288 Medicare Part D claims for 901 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 72 claims were for opioids.
Most prescribed
- Levothyroxine Sodium830 claims
- Atorvastatin Calcium724 claims
- Losartan Potassium634 claims
- Rosuvastatin Calcium476 claims
- Amlodipine Besylate363 claims
- Gabapentin351 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): 73.2 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: $1,888.29
84 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Newport Medicine Group IncNewport Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Katz among 17,696 internal medicine physician records in California
Gregory Katz, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1991 · median 2004 among the 11,065 with a school on file
- Record last updated2016 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
94 internal medicine physician records list a practice address in Newport Beach
They are 94 of the 4,414 NPPES records with a practice address in Newport Beach, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Newport Beach → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Brouwer, MDNewport Beach, CA 926631629018544
- William Bruce, MDNewport Beach, CA 926631265490890
- Gary Carlson, MDNewport Beach, CA 926631497700116
- David Chun, MDNewport Beach, CA 926631730152976
- Dennis Jordanides, M.D.Newport Beach, CA 926631285638031
- Kambiz Karimi, MDNewport Beach, CA 926631720061823
- Cameron Khavarian, M.D.Newport Beach, CA 926631104871938
- Ryan Klein, MDNewport Beach, CA 926631184620866
Common questions
What is Gregory Katz, MD's NPI number?
Gregory Katz, MD's National Provider Identifier (NPI) is 1184674178, issued on May 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Katz, MD located?
The NPPES record lists a practice address at 520 Superior Ave, Newport Beach, CA, 92663. Phone: (949) 642-2333. Providers update this record themselves, so call before visiting.
How can I verify Gregory Katz, MD's license?
NPPES lists California license number G76136, 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 Gregory Katz, MD prescribe under Medicare Part D?
In 2024, Gregory Katz, MD had 12,288 Medicare Part D claims for 901 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Gregory Katz, MD's MIPS final score?
The 2023 MIPS final score is 73.2 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.