Zainulabuddin Syed, M.D.
NPI 1609876424 · Internal Medicine Physician · Downers Grove, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zainulabuddin Syed, M.D. is a Internal Medicine Physician provider in Downers Grove, IL (NPI 1609876424).
Provider details
- NPI number
- 1609876424
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036091132 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
685 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 | 187 | $84 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 121 | $132 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 71 | $80 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 71 | $120 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 68 | $133 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 65 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 219 | 52 |
| Levothyroxine Sodium | 171 | 43 |
| Metformin Hcl | 153 | 45 |
| Amlodipine Besylate | 119 | 36 |
| Simvastatin | 105 | 28 |
| Lisinopril | 89 | 32 |
| Metoprolol Tartrate | 89 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-22
- Last updated
- 2026-03-02
- Certified
- 2026-03-02
Frequently asked questions
- What is Zainulabuddin Syed's NPI number?
- Zainulabuddin Syed's National Provider Identifier (NPI) is 1609876424, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zainulabuddin Syed's specialty?
- Zainulabuddin Syed is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Zainulabuddin Syed located?
- Zainulabuddin Syed's practice location on file with NPPES is 4121 Fairview Ave Ste L1, Downers Grove, IL 60515-2265.
- What is Zainulabuddin Syed's phone number?
- The practice phone number listed in the NPPES registry for Zainulabuddin Syed is (630) 968-4790.
- Does Zainulabuddin Syed accept Medicare?
- Zainulabuddin Syed is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zainulabuddin Syed's NPI active?
- Yes — Zainulabuddin Syed's NPI (1609876424) is active in the NPPES registry as of the last update on 2026-03-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.