Michael Grossman, M.D.
NPI 1942367008 · Family Medicine Physician · Lake Forest, CA
Michael Grossman, M.D. is a Family Medicine Physician provider in Lake Forest, CA (NPI 1942367008).
Provider details
- NPI number
- 1942367008
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G33405 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Levothyroxine Sodium | 33 |
| Hydrocortisone | 17 |
| Testosterone Cypionate | 16 |
| Metformin Hcl | 15 |
| Lorazepam | 12 |
| Progesterone, Micronizedbrand: Progesterone | 12 |
| Rosuvastatin Calcium | 11 |
| Finasteride | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-01
- Last updated
- 2008-03-27
Frequently asked questions
- What is Michael Grossman's NPI number?
- Michael Grossman's National Provider Identifier (NPI) is 1942367008, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Grossman's specialty?
- Michael Grossman is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Grossman located?
- Michael Grossman's practice location on file with NPPES is 24432 Muirlands Blvd, Lake Forest, CA 92630-3939.
- What is Michael Grossman's phone number?
- The practice phone number listed in the NPPES registry for Michael Grossman is (949) 770-7301.
- Is Michael Grossman's NPI active?
- Yes — Michael Grossman's NPI (1942367008) is active in the NPPES registry as of the last update on 2008-03-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.