John Grabowski, M.D., P.L.L.C.
NPI 1487378113 · Psychiatry Physician · Warren, MI
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Grabowski, M.D., P.L.L.C. is a Psychiatry Physician organization in Warren, MI (NPI 1487378113).
Provider details
- NPI number
- 1487378113
- Entity type
- Organization
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- John Grabowski, Physician(586) 582-7979
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
3 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
- 2022-09-27
- Last updated
- 2022-09-27
- Certified
- 2022-09-27
Frequently asked questions
- What is John Grabowski, M.D., P.L.L.C.'s NPI number?
- John Grabowski, M.D., P.L.L.C.'s National Provider Identifier (NPI) is 1487378113, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John Grabowski, M.D., P.L.L.C.?
- John Grabowski, M.D., P.L.L.C. is classified in the NPPES registry as Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is John Grabowski, M.D., P.L.L.C. located?
- John Grabowski, M.D., P.L.L.C.'s practice location on file with NPPES is 27550 Schoenherr, Warren, MI 48088.
- What is John Grabowski, M.D., P.L.L.C.'s phone number?
- The practice phone number listed in the NPPES registry for John Grabowski, M.D., P.L.L.C. is (586) 582-7979.
- Does John Grabowski, M.D., P.L.L.C. accept Medicare?
- John Grabowski, M.D., P.L.L.C. is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for John Grabowski, M.D., P.L.L.C.?
- The authorized official listed on John Grabowski, M.D., P.L.L.C.'s NPPES record is John Grabowski, Physician. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John Grabowski, M.D., P.L.L.C.'s NPI active?
- Yes — John Grabowski, M.D., P.L.L.C.'s NPI (1487378113) is active in the NPPES registry as of the last update on 2022-09-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.