John M. Grollmus, M.D., Inc.
NPI 1851337380 · Neurological Surgery Physician · Santa Rosa, CA
John M. Grollmus, M.D., Inc. is a Neurological Surgery Physician organization in Santa Rosa, CA (NPI 1851337380).
Provider details
- NPI number
- 1851337380
- Entity type
- Organization
- Primary specialty
- Neurological Surgery PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- John Grollmus, Owner/ Lead Physician(707) 525-0696
- License
- C27979 (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
20 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-22
- Last updated
- 2020-08-22
Frequently asked questions
- What is John M. Grollmus, M.D., Inc.'s NPI number?
- John M. Grollmus, M.D., Inc.'s National Provider Identifier (NPI) is 1851337380, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John M. Grollmus, M.D., Inc.?
- John M. Grollmus, M.D., Inc. is classified in the NPPES registry as Neurological Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is John M. Grollmus, M.D., Inc. located?
- John M. Grollmus, M.D., Inc.'s practice location on file with NPPES is 990 Sonoma Ave, Santa Rosa, CA 95404-4802.
- What is John M. Grollmus, M.D., Inc.'s phone number?
- The practice phone number listed in the NPPES registry for John M. Grollmus, M.D., Inc. is (707) 525-0696.
- Who is the authorized official for John M. Grollmus, M.D., Inc.?
- The authorized official listed on John M. Grollmus, M.D., Inc.'s NPPES record is John Grollmus, Owner/ Lead Physician. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John M. Grollmus, M.D., Inc.'s NPI active?
- Yes — John M. Grollmus, M.D., Inc.'s NPI (1851337380) is active in the NPPES registry as of the last update on 2020-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.