Nisar Ahmad, M.D.
NPI 1659390045 · Hematology (Internal Medicine) Physician · Harlingen, TX
Enrolled with Medicare as Practitioner - Hematology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nisar Ahmad, M.D. is a Hematology (Internal Medicine) Physician provider in Harlingen, TX (NPI 1659390045).
Provider details
- NPI number
- 1659390045
- Entity type
- Individual
- Primary specialty
- Hematology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- N4887 (TX)
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
19 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
3,053 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 | 942 | $99 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 687 | $17 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 671 | $146 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 183 | $80 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 113 | $184 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 93 | 44 |
| Prednisone | 47 | 22 |
| Hydroxyurea | 41 | 16 |
| Dexamethasone | 40 | 30 |
| Tamoxifen Citrate | 39 | 17 |
| Potassium Chloride | 36 | 24 |
| Alendronate Sodium | 33 | 12 |
| Mirtazapine | 28 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-18
- Last updated
- 2022-07-21
Frequently asked questions
- What is Nisar Ahmad's NPI number?
- Nisar Ahmad's National Provider Identifier (NPI) is 1659390045, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nisar Ahmad's specialty?
- Nisar Ahmad is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Nisar Ahmad located?
- Nisar Ahmad's practice location on file with NPPES is 1719 Treasure Hills Blvd, Harlingen, TX 78550-8912.
- What is Nisar Ahmad's phone number?
- The practice phone number listed in the NPPES registry for Nisar Ahmad is (956) 364-2131.
- Does Nisar Ahmad accept Medicare?
- Nisar Ahmad is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nisar Ahmad's NPI active?
- Yes — Nisar Ahmad's NPI (1659390045) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.