Tahir Mahmood, MD
NPI 1598849895 · Internal Medicine Physician · Lombard, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tahir Mahmood, MD is a Internal Medicine Physician provider in Lombard, IL (NPI 1598849895).
Provider details
- NPI number
- 1598849895
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036108276 (IL)
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
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
150 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 79 | $81 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 30 | $162 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 22 | $108 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 19 | $5 |
Typical Medicare-allowed amounts for these services range $5–$162 (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 |
|---|---|---|
| Atorvastatin Calcium | 119 | 25 |
| Levothyroxine Sodium | 74 | — |
| Lisinopril | 67 | — |
| Metoprolol Tartrate | 58 | — |
| Simvastatin | 54 | — |
| Budesonidebrand: Budesonide Dr | 52 | — |
| Donepezil Hcl | 52 | — |
Practice location
Mailing address
Additional practice locations (3)
- 875 South Route 31Crystal Lake, IL 60014Phone: (779) 220-5500
- 901 Grant StHarvard, IL 60033-1821Phone: (815) 943-5431
- 2000 Lake AveWoodstock, IL 60098-7401Phone: (815) 337-8603
Registry dates
- Enumerated
- 2006-10-24
- Last updated
- 2024-03-15
- Certified
- 2024-03-14
Frequently asked questions
- What is Tahir Mahmood's NPI number?
- Tahir Mahmood's National Provider Identifier (NPI) is 1598849895, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tahir Mahmood's specialty?
- Tahir Mahmood is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tahir Mahmood located?
- Tahir Mahmood's practice location on file with NPPES is 2500 S Highland Ave Ste 230, Lombard, IL 60148-7103.
- What is Tahir Mahmood's phone number?
- The practice phone number listed in the NPPES registry for Tahir Mahmood is (630) 429-9000.
- Does Tahir Mahmood accept Medicare?
- Tahir Mahmood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tahir Mahmood's NPI active?
- Yes — Tahir Mahmood's NPI (1598849895) is active in the NPPES registry as of the last update on 2024-03-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.