Robert A. Grossman, MD
Obstetrics Physician · Thousand Oaks, CA
Robert A. Grossman, MD is an obstetrics physician with a practice address in Thousand Oaks, California, and NPI 1053462606, issued on Jan 12, 2007. Check the license (California G039997, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert A. Grossman
- Credential
- MD
- Primary taxonomy
- Obstetrics Physician 207VX0000X
- License number
- G039997 CA
Self-reported in NPPES; status is on the state search - Practice location
- 558 Ventu Park RD Ste A, Thousand Oaks, CA 91320
- Phone
- (818) 817-9832
- Enumerated
- Jan 12, 2007
- Record last updated
- Oct 23, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (818) 817-9835
- Medicare enrollment
- Enrolled (PECOS I20090903000178); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1978
- Entity
- Type 1 · individual
8 nearest obstetrics physician records → All 174 in California → Look up another NPI →
Verify Robert A. Grossman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G039997Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average obstetrics physician in 2024
640 Medicare Part D claims for 143 beneficiaries, against an average of 218 among the 863 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol139 claims
- Progesterone66 claims
- Estradiol (Twice Weekly)45 claims
- Terconazole33 claims
- Nitrofurantoin Mono-Macro26 claims
- Clotrimazole-Betamethasone25 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.
Industry payments in 2024: $64.51
2 payments; by number, the most common kind was food and beverage; the largest payer was Smith+Nephew, Inc. The 679 providers of this specialty with any payment received $826.19 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.
Robert A. Grossman among 174 obstetrics physician records in California
Robert A. Grossman, MD is one of 174 obstetrics physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 39% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated1978 · median 2002 among the 91 with a school on file
- Record last updated2014 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VX0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics Physician providers in California
There are 174 obstetrics physician records in California.
All 174 in California → Every provider in Thousand Oaks → Obstetrics Physician nationwide →
The 8 obstetrics physician records with the nearest ZIP codes
- Joie Russo, M.D.Encino, CA 913161619988532
- Maryam Ardalan, MDSanta Clarita, CA 913551396936217
- Ming-Kong Chen, M.D.Valencia, CA 913551316276942
- Don Nishiguchi, M.D.Valencia, CA 913551043368277
- Rebecca Perlow, D.O.Tarzana, CA 913561346235157
- Payman Joseph, M.D.Van Nuys, CA 914051184736589
- Cesar Caldera, M.DGlendale, CA 912041912010778
- Richard Friedman, M.D.Burbank, CA 915051285641837
Common questions
What is Robert A. Grossman, MD's NPI number?
Robert A. Grossman, MD's National Provider Identifier (NPI) is 1053462606, issued on Jan 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Robert A. Grossman, MD located?
The NPPES record lists a practice address at 558 Ventu Park RD Ste A, Thousand Oaks, CA, 91320. Phone: (818) 817-9832. Providers update this record themselves, so call before visiting.
How can I verify Robert A. Grossman, MD's license?
NPPES lists California license number G039997, 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 A. Grossman, MD prescribe under Medicare Part D?
In 2024, Robert A. Grossman, MD had 640 Medicare Part D claims for 143 beneficiaries; the average among obstetrics physician prescribers was 218. 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.