NPPES file of Aug 9, 2026

Nisar Ahmad, M.D.

Hematology (Internal Medicine) Physician · Harlingen, TX

Nisar Ahmad, M.D. is a hematology (internal medicine) physician with a practice address in Harlingen, Texas, and NPI 1659390045, issued on Jul 18, 2006. Check the license (Texas N4887, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1659390045
Name
Nisar Ahmad
Credential
M.D.
Primary taxonomy
Hematology (Internal Medicine) Physician 207RH0000X
License number
N4887 TX
Self-reported in NPPES; status is on the state search
Practice location
1719 Treasure Hills Blvd, Harlingen, TX 78550
Phone
(956) 364-2131
Enumerated
Jul 18, 2006
Record last updated
Jul 21, 2022
Fax
(956) 364-2141
Medicaid IDs
419512400 MD
374773501 TX
0070245 OH
Medicare enrollment
Enrolled (PECOS I20190226003112); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 1719 Treasure Hills Blvd

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Ladislao Cardenas, RPHPharmacist1114723236
  2. Laura Cisneros, MDHematology & Oncology Physician1881683159
  3. Veronica Schubert, PHARMDPharmacist1992568620

Verify Nisar Ahmad in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersTexas Medical Board
    Search for license N4887    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Texas license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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2.1 times the Medicare Part D claims of the average hematology (internal medicine) physician in 2024

1,051 Medicare Part D claims for 282 beneficiaries, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. 48 claims were for opioids.

  1. Nisar Ahmad1,051
  2. Specialty average496

Most prescribed

  1. Anastrozole93 claims
  2. Prednisone47 claims
  3. Hydroxyurea41 claims
  4. Dexamethasone40 claims
  5. Tamoxifen Citrate39 claims
  6. Potassium Chloride36 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Bills Medicare through one group practice

  1. Berkshire Faculty Services IncPittsfield, MA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Hematology (Internal Medicine) Physician providers in Texas

There are 73 hematology (internal medicine) physician records in Texas.

All 73 in Texas → Every provider in Harlingen →

Other hematology (internal medicine) physician records in Texas

  1. Mohammad Abdulla, MDHouston, TX1912884222
  2. Tareq Abuasab, MDHouston, TX1598430043
  3. Aimaz Afrough, M.D.Dallas, TX1477964518
  4. Yosra Aljawai, M.D.Houston, TX1508355256
  5. Yesid Alvarado Valero, M.D.Houston, TX1982876272
  6. Effrosyni Apostolidou, MD, PHDHouston, TX1386872687
  7. Caroline Arber Barth, M.D.Houston, TX1750750899
  8. Kelty Baker, MDHouston, TX1710090857
  9. Robert Bast, MDHouston, TX1013901008
  10. Taha Bat, MDDallas, TX1679915102

Common questions

What is Nisar Ahmad, M.D.'s NPI number?

Nisar Ahmad, M.D.'s National Provider Identifier (NPI) is 1659390045, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Nisar Ahmad, M.D. located?

The NPPES record lists a practice address at 1719 Treasure Hills Blvd, Harlingen, TX, 78550. Phone: (956) 364-2131. Providers update this record themselves, so call before visiting.

How can I verify Nisar Ahmad, M.D.'s license?

NPPES lists Texas license number N4887, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Nisar Ahmad, M.D. prescribe under Medicare Part D?

In 2024, Nisar Ahmad, M.D. had 1,051 Medicare Part D claims for 282 beneficiaries; the average among hematology (internal medicine) physician prescribers was 496. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.