Richard Nierenberg, MD
NPI 1598870628 · Hospitalist Physician · Phoenix, AZ
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Richard Nierenberg, MD is a Hospitalist Physician provider in Phoenix, AZ (NPI 1598870628).
Provider details
- NPI number
- 1598870628
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 44026 (AZ)
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 tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
700 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 358 | $113 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 193 | $109 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 103 | $165 |
| Critical Care, First 30-74 Minutes99291 | 46 | $203 |
Typical Medicare-allowed amounts for these services range $109–$203 (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 |
|---|---|---|
| Apixabanbrand: Eliquis | 39 | 18 |
| Prednisone | 34 | 33 |
| Cefuroxime Axetilbrand: Cefuroxime | 30 | 30 |
| Atorvastatin Calcium | 24 | 16 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 24 | 19 |
| Furosemide | 22 | 12 |
| Metoprolol Succinate |
Practice location
Mailing address
Additional practice locations (2)
- 1500 S Mill AveTempe, AZ 85281-6699Phone: (602) 251-8316Fax: (480) 333-5165
- 415 S 28th AveHattiesburg, MS 39401-7246Phone: (601) 288-4329Fax: (601) 288-3191
Registry dates
- Enumerated
- 2006-08-20
- Last updated
- 2019-01-22
Frequently asked questions
- What is Richard Nierenberg's NPI number?
- Richard Nierenberg's National Provider Identifier (NPI) is 1598870628, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Richard Nierenberg's specialty?
- Richard Nierenberg is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Richard Nierenberg located?
- Richard Nierenberg's practice location on file with NPPES is 1800 E Van Buren St, Phoenix, AZ 85006.
- What is Richard Nierenberg's phone number?
- The practice phone number listed in the NPPES registry for Richard Nierenberg is (602) 251-8316.
- Does Richard Nierenberg accept Medicare?
- Richard Nierenberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Richard Nierenberg's NPI active?
- Yes — Richard Nierenberg's NPI (1598870628) is active in the NPPES registry as of the last update on 2019-01-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.