Robert Gross, DO
Internal Medicine Physician · Lake Isabella, CA
Robert Gross, DO is an internal medicine physician with a practice address in Lake Isabella, California, and NPI 1396827358, issued on Oct 19, 2006. Check the license (California 20A7951, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert Gross
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A7951 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6425 Lynch Canyon Dr, Lake Isabella, CA 93240
- Phone
- (760) 379-8630
- Enumerated
- Oct 19, 2006
- Record last updated
- Jun 30, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170823001167); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 1998
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 6425 Lynch Canyon Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gary Finstad, M.D.Internal Medicine Physician1184763633
- James Gutzman, PA-C, RN, FNPPhysician Assistant1295834844
- Phillip Martin, MDInternal Medicine Physician1275580680
- Holly Spohn-Gross, DPMPodiatrist1659453611
Verify Robert Gross in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A7951Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% more Medicare Part D claims than the average internal medicine physician in 2024
3,806 Medicare Part D claims for 135 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 77 claims were for opioids.
Most prescribed
- Eliquis350 claims
- Atorvastatin Calcium237 claims
- Tradjenta189 claims
- Omeprazole178 claims
- Furosemide165 claims
- Gabapentin147 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.
2 hospitals and group practices
- Kern Valley Healthcare DistrictLake Isabella, CA · Critical Access Hospitals3 of 5 stars
- Sienna Medical CorporationLake Isabella, CA
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.
Robert Gross among 17,696 internal medicine physician records in California
Robert Gross, DO 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
- Graduated1998 · 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).
4 internal medicine physician records list a practice address in Lake Isabella
They are 4 of the 140 NPPES records with a practice address in Lake Isabella, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Lake Isabella → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Gary Finstad, M.D.Lake Isabella, CA 932401184763633
- Paul Giem, MDLake Isabella, CA 932401366499774
- Phillip Martin, MDLake Isabella, CA 932401275580680
- Orestes Pavia Sanchez, M.D.Lamont, CA 932411841231263
- Walter Ventayen, MDLamont, CA 932411841303286
- James Ripple, M.D.Lemoore, CA 932461457579781
- Osvaldo Gutierrez-Navarro, MDLindsay, CA 932471407576192
- John Gavini, M.D.Hanford, CA 932301750328803
Common questions
What is Robert Gross, DO's NPI number?
Robert Gross, DO's National Provider Identifier (NPI) is 1396827358, issued on Oct 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Gross, DO located?
The NPPES record lists a practice address at 6425 Lynch Canyon Dr, Lake Isabella, CA, 93240. Phone: (760) 379-8630. Providers update this record themselves, so call before visiting.
How can I verify Robert Gross, DO's license?
NPPES lists California license number 20A7951, 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 Robert Gross, DO prescribe under Medicare Part D?
In 2024, Robert Gross, DO had 3,806 Medicare Part D claims for 135 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.