Mark Greenberg, MD
NPI 1992757405 · Rheumatology Physician · Saint Joseph, MI
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Greenberg, MD is a Rheumatology Physician provider in Saint Joseph, MI (NPI 1992757405).
Provider details
- NPI number
- 1992757405
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- EMC0007457 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 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
100 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 100 | $123 |
Typical Medicare-allowed amounts for these services range $123–$123 (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 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 161 | 74 |
| Hydroxychloroquine Sulfate | 134 | 53 |
| Methotrexate Sodiumbrand: Methotrexate | 102 | 46 |
| Leflunomide | 78 | 28 |
| Methylprednisolone | 46 | 13 |
| Adalimumabbrand: Humira(cf) Pen | 40 | — |
| Tocilizumabbrand: Actemra Actpen |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$20 across 1 record (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
- 2006-05-16
- Last updated
- 2025-10-07
- Certified
- 2025-10-07
Frequently asked questions
- What is Mark Greenberg's NPI number?
- Mark Greenberg's National Provider Identifier (NPI) is 1992757405, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Greenberg's specialty?
- Mark Greenberg is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Greenberg located?
- Mark Greenberg's practice location on file with NPPES is 3950 Hollywood Rd Ste 288, Saint Joseph, MI 49085-9159.
- What is Mark Greenberg's phone number?
- The practice phone number listed in the NPPES registry for Mark Greenberg is (269) 408-0990.
- Does Mark Greenberg accept Medicare?
- Mark Greenberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Greenberg's NPI active?
- Yes — Mark Greenberg's NPI (1992757405) is active in the NPPES registry as of the last update on 2025-10-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.