Gregory A. Robertson, M.D.
Internal Medicine Physician · Newport Beach, CA
Gregory A. Robertson, M.D. is an internal medicine physician with a practice address in Newport Beach, California, and NPI 1932281011, issued on Oct 19, 2006. Check the license (California G50555, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory A. Robertson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G50555 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20311 SW Acacia St, Newport Beach, CA 92660
- Phone
- (949) 250-4244
- Enumerated
- Oct 19, 2006
- Record last updated
- Aug 4, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120323000136); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 1982
- 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 20311 SW Acacia St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Russell Alterman, D.O.Internal Medicine Physician1487609939
- Jeffrey Bloom, D.O.Sports Medicine (Family Medicine) Physician1669472148
Verify Gregory A. Robertson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G50555Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% more Medicare Part D claims than the average internal medicine physician in 2024
4,777 Medicare Part D claims for 233 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims. 150 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium242 claims
- Levothyroxine Sodium231 claims
- Irbesartan144 claims
- Pantoprazole Sodium126 claims
- Mounjaro125 claims
- Alprazolam109 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $3,072.26
126 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.
Gregory A. Robertson among 17,696 internal medicine physician records in California
Gregory A. Robertson, M.D. 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
- Graduated1982 · median 2004 among the 11,065 with a school on file
- Record last updated2008 · 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
- Russell Alterman, D.O.Newport Beach, CA 926601487609939
- Sharon Bae, M.D.Newport Beach, CA 926601346211372
- Susan Cederstrom, M.D.Newport Beach, CA 926601578529012
- Zoltan Csuka, MDNewport Beach, CA 926601679539951
- William Fukuda, M.D.Newport Beach, CA 926601396701850
- Gilbert Goodman, M.D.Newport Beach, CA 926601851357867
- Richard Harano, M.DNewport Beach, CA 926601235185695
- Bradley Kays, M.D.Newport Beach, CA 926601417914334
Common questions
What is Gregory A. Robertson, M.D.'s NPI number?
Gregory A. Robertson, M.D.'s National Provider Identifier (NPI) is 1932281011, issued on Oct 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory A. Robertson, M.D. located?
The NPPES record lists a practice address at 20311 SW Acacia St, Newport Beach, CA, 92660. Phone: (949) 250-4244. Providers update this record themselves, so call before visiting.
How can I verify Gregory A. Robertson, M.D.'s license?
NPPES lists California license number G50555, 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 A. Robertson, M.D. prescribe under Medicare Part D?
In 2024, Gregory A. Robertson, M.D. had 4,777 Medicare Part D claims for 233 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Gregory A. Robertson, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.