Warren Fields, M.D.
NPI 1225158694 · Pulmonary Disease Physician · Royal Oak, MI
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Warren Fields, M.D. is a Pulmonary Disease Physician provider in Royal Oak, MI (NPI 1225158694).
Provider details
- NPI number
- 1225158694
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4301076558 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
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
19 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
2,638 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 611 | $79 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 521 | $128 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 288 | $118 |
| Test to Examine How Well the Lungs Exchange Gases94729 | 255 | $55 |
| Test to Determine Lung Volumes Using Gas Dilution Or Washout94727 | 251 | $44 |
| Test to Measure Expiratory Airflow and Volume Changes Before and After Medication Administration94060 | 242 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 39 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 375 | 127 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 256 | 65 |
| Prednisone | 241 | 104 |
| Azelastine Hcl | 98 | 58 |
| Tiotropium Bromidebrand: Spiriva Respimat | 82 | 23 |
| Budesonide/Glycopyr/Formoterolbrand: Breztri Aerosphere | 80 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,349 across 68 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
- 2007-03-30
- Last updated
- 2024-09-12
- Certified
- 2024-09-12
Frequently asked questions
- What is Warren Fields's NPI number?
- Warren Fields's National Provider Identifier (NPI) is 1225158694, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Warren Fields's specialty?
- Warren Fields is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Warren Fields located?
- Warren Fields's practice location on file with NPPES is 30701 Woodward Ave Ste 200, Royal Oak, MI 48073-0990.
- What is Warren Fields's phone number?
- The practice phone number listed in the NPPES registry for Warren Fields is (248) 548-2114.
- Does Warren Fields accept Medicare?
- Warren Fields is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Warren Fields's NPI active?
- Yes — Warren Fields's NPI (1225158694) 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.