Quick answers
- Does Horst Griesser accept Medicare assignment?
- Yes. Medicare's clinician data says Horst Griesser accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Horst Griesser see?
- In 2024, CMS data shows 126 Original Medicare patients and 271 services for Horst Griesser. This counts Original Medicare only and measures volume, not quality.
- What is Horst Griesser's NPI number?
- 1336158849. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Horst Griesser, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 126 |
|---|---|
| Services billed to Medicare | 271 |
| Different services or procedures | 39 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)32 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)30 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)27 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)18 services
- Detection test by immunoassay with direct visual observation for influenza virus (87804)17 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol74%
- High blood pressure71%
- Arthritis50%
- Diabetes29%
- Anxiety27%
- Depression25%
Practice locations
Addresses where Horst Griesser is enrolled with Medicare (CMS data updated October 2, 2026).
- 13530 Michigan Ave, Suite 110Dearborn, MI 48126 (313) 572‑0810
- 3280 Washtenaw AveAnn Arbor, MI 48104 (734) 389‑2000
- 5456 15 Mile Rd, Suite 101Sterling Heights, MI 48310 (313) 572‑0810
- 5800 Highland RdWaterford, MI 48327 (248) 290‑5700
Group practices
Medicare enrollment lists Horst Griesser as a member of these groups (CMS data updated October 2, 2026).
- Specialty Medical Center Inc23 clinicians in the group
- Nextcare Michigan Providers PLLC16 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Dearborn
Clinicians with the same Medicare primary specialty in Dearborn, MI — not a recommendation.
Other clinicians in Specialty Medical Center Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336158849 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians