Michael Greiner, NP-C, D.C.
NPI 1942452453 · Nurse Practitioner · Warren, MI
Enrolled with Medicare as Practitioner - Chiropractic · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Greiner, NP-C, D.C. is a Nurse Practitioner provider in Warren, MI (NPI 1942452453).
Provider details
- NPI number
- 1942452453
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP-C, D.C.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MG009739 (MI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Chiropractic Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
48 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Chiropractic Manipulative Treatment, 3-4 Spinal Regions98941 | 48 | $38 |
Typical Medicare-allowed amounts for these services range $38–$38 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tizanidine Hcl | 95 | 57 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 92 | 55 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 83 | 40 |
| Diclofenac Sodium | 64 | 41 |
| Gabapentin | 60 | 30 |
| Cyclobenzaprine Hcl | 43 | 27 |
| Ibuprofen | 30 | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$180 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-10-15
- Last updated
- 2024-09-12
- Certified
- 2024-09-12
Frequently asked questions
- What is Michael Greiner's NPI number?
- Michael Greiner's National Provider Identifier (NPI) is 1942452453, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Greiner's specialty?
- Michael Greiner is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Michael Greiner located?
- Michael Greiner's practice location on file with NPPES is 2243 E 12 Mile Rd, Warren, MI 48092-5644.
- What is Michael Greiner's phone number?
- The practice phone number listed in the NPPES registry for Michael Greiner is (586) 573-8100.
- Does Michael Greiner accept Medicare?
- Michael Greiner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Greiner's NPI active?
- Yes — Michael Greiner's NPI (1942452453) is active in the NPPES registry as of the last update on 2024-09-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.