Farzan Mahmood, M.D
NPI 1841484961 · Rheumatology Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Farzan Mahmood, M.D is a Rheumatology Physician provider in Naperville, IL (NPI 1841484961).
Provider details
- NPI number
- 1841484961
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- No
- License
- 125049227 (IL)
Specialties & taxonomies
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 tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
586 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 226 | $121 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 116 | $164 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 75 | $8 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 65 | $13 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 55 | $68 |
| Aspiration And/Or Injection of Fluid From Small Joint20600 | 36 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alendronate Sodium | 410 | 157 |
| Prednisone | 327 | 125 |
| Methotrexate Sodiumbrand: Methotrexate | 188 | 84 |
| Allopurinol | 186 | 49 |
| Meloxicam | 148 | 57 |
| Duloxetine Hcl | 136 | 37 |
| Gabapentin | 84 | 25 |
Practice location
Mailing address
Additional practice locations (1)
- 818 Forest LnWaterford, WI 53185-4585Phone: (262) 514-3700
Registry dates
- Enumerated
- 2007-08-31
- Last updated
- 2024-05-28
- Certified
- 2024-05-28
Frequently asked questions
- What is Farzan Mahmood's NPI number?
- Farzan Mahmood's National Provider Identifier (NPI) is 1841484961, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Farzan Mahmood's specialty?
- Farzan Mahmood is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Farzan Mahmood located?
- Farzan Mahmood's practice location on file with NPPES is 1508 Sequoia Rd, Naperville, IL 60540-6389.
- What is Farzan Mahmood's phone number?
- The practice phone number listed in the NPPES registry for Farzan Mahmood is (630) 585-7100.
- Does Farzan Mahmood accept Medicare?
- Farzan Mahmood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Farzan Mahmood's NPI active?
- Yes — Farzan Mahmood's NPI (1841484961) is active in the NPPES registry as of the last update on 2024-05-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.