Michael Jack Grossman, M.D.
Family Medicine Physician · Lake Forest, CA
Michael Jack Grossman, M.D. is a family medicine physician with a practice address in Lake Forest, California, and NPI 1942367008, issued on Jan 1, 2007. Check the license (California G33405, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Jack Grossman
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G33405 CA
Self-reported in NPPES; status is on the state search - Practice location
- 24432 Muirlands Blvd, Lake Forest, CA 92630
- Phone
- (949) 770-7301
- Enumerated
- Jan 1, 2007
- Record last updated
- Mar 27, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (949) 770-0634
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 24432 Muirlands Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Brizendine, DDSGeneral Practice Dentistry1871573543
- Anthony Follico, DDSDentist1568565653
- James Kay, D.O.Pediatrics Physician1962616656
- Azin Meshkinpour, M.D., M.P.H.Dermatology Physician1205802089
- Darren Terry, D.P.T.Physical Therapist1336412998
Verify Michael Jack Grossman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G33405Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average family medicine physician in 2024
344 Medicare Part D claims for 49 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Levothyroxine Sodium33 claims
- Hydrocortisone17 claims
- Testosterone Cypionate16 claims
- Metformin Hcl15 claims
- Lorazepam12 claims
- Progesterone12 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.
Michael Jack Grossman among 17,133 family medicine physician records in California
Michael Jack Grossman, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% 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 41% of them.
- NPI issued2007 · 41% of these records are older, 47% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2008 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 family medicine physician records list a practice address in Lake Forest
They are 14 of the 1,008 NPPES records with a practice address in Lake Forest, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Lake Forest → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Mohammed Ali, M.D.Lake Forest, CA 926301053405506
- Carol Barnes-Blanks, MDLake Forest, CA 926301720009152
- Chyle Beaird, M.D.Lake Forest, CA 926301043374473
- Adel Boutros, MDLake Forest, CA 926301700952827
- Gertrude Chancellor, FNP-BCLake Forest, CA 926301467944900
- James Decock, M.DLake Forest, CA 926301720019904
- Carrie Diramio, MDLake Forest, CA 926301790782993
- Mary Koumas, D.O.Lake Forest, CA 926301306838909
Common questions
What is Michael Jack Grossman, M.D.'s NPI number?
Michael Jack Grossman, M.D.'s National Provider Identifier (NPI) is 1942367008, issued on Jan 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michael Jack Grossman, M.D. located?
The NPPES record lists a practice address at 24432 Muirlands Blvd, Lake Forest, CA, 92630. Phone: (949) 770-7301. Providers update this record themselves, so call before visiting.
How can I verify Michael Jack Grossman, M.D.'s license?
NPPES lists California license number G33405, 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 Michael Jack Grossman, M.D. prescribe under Medicare Part D?
In 2024, Michael Jack Grossman, M.D. had 344 Medicare Part D claims for 49 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.