NPPES file of Aug 9, 2026

Siayareh Rambally, M.D.

Hematology & Oncology Physician · Dallas, TX

Siayareh Rambally, M.D. is a hematology & oncology physician with a practice address in Dallas, Texas, and NPI 1811142581, issued on Nov 22, 2008. Check the license (Texas N5959, 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 2023 and 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1811142581
Name
Siayareh Rambally
Credential
M.D.
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
N5959 TX
Self-reported in NPPES; status is on the state search
Practice location
5323 Harry Hines Blvd, Dallas, TX 75390
Phone
(214) 645-4673
Enumerated
Nov 22, 2008
Record last updated
Jun 28, 2013 (not updated in 13 years: call before relying on the address or phone)
Fax
(214) 645-2615
Medicare enrollment
Enrolled (PECOS I20130820000437); accepts Medicare assignment
Medical or professional school
University Of Texas Southwestern Medical School At Dallas, 2007
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 5323 Harry Hines Blvd

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

  1. Ali Abbas, MDStudent in an Organized Health Care Education/Training Program1447822507
  2. Laila Abbas, MDStudent in an Organized Health Care Education/Training Program1861132524
  3. Eileen Abbasi, CRNACertified Registered Nurse Anesthetist1588918981
  4. Mina Abbassi-Ghanavati, MDObstetrics & Gynecology Physician1154509610
  5. Abier Abdelnaby, M.D.Colon & Rectal Surgery Physician1831312503
  6. Ahmed AbdiStudent in an Organized Health Care Education/Training Program1952095184

Verify Siayareh Rambally in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersTexas Medical Board
    Search for license N5959
    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

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55% fewer Medicare Part D claims than the average hematology & oncology physician in 2024

391 Medicare Part D claims for 70 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims. 81 claims were for opioids.

  1. Siayareh Rambally391
  2. Specialty average877

Most prescribed

  1. Hydroxyurea103 claims
  2. Eliquis52 claims
  3. Hydrocodone-Acetaminophen34 claims
  4. Oxycodone Hcl28 claims
  5. Besremi25 claims
  6. Hydromorphone Hcl18 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.

The practice group's MIPS final score for 2023 (Medicare payment program): 74.6 of 100

The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.

  1. Qualityout of 100 · 30% of the final score56.1
  2. Costout of 100 · 30%59.2
  3. Promoting interoperabilityout of 100 · 25%100.0
  4. Improvement activities40 of 40 points · 15%100.0

Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).

Industry payments in 2024: $26.43

1 payment: food and beverage; the largest payer was Celgene Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Siayareh Rambally$26.43
  2. Specialty average$7,481.41

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. University OF Texas Southwestern Medical Center AT DallasDallas, TX

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

Hematology & Oncology Physician providers in Texas

There are 922 hematology & oncology physician records in Texas.

Other hematology & oncology physician records in Texas

  1. Kanza Abbas, M.D.Houston, TX1396065934
  2. Elham Abbasi-Hafshejani, M.D.The Woodlands, TX1306856513
  3. Raghad Abdul-Karim, MDMcAllen, TX1114207172
  4. Seyed Abedi, M.D.,PH.D.Cedar Park, TX1033567409
  5. Muhammad Abid, M.D.Lubbock, TX1639480437
  6. Ambrose Aboud, MDEl Paso, TX1407843873
  7. Hesham Abowali, MDGalveston, TX1447806955
  8. Joel Abramowitz, M.D., PHDHouston, TX1447220413
  9. Hussna Abunafeesa, M.DDallas, TX1902338726
  10. Prashanth Adapala, M.D.Marble Falls, TX1740484336

Common questions

What is Siayareh Rambally, M.D.'s NPI number?

Siayareh Rambally, M.D.'s National Provider Identifier (NPI) is 1811142581, issued on Nov 22, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Siayareh Rambally, M.D. located?

The NPPES record lists a practice address at 5323 Harry Hines Blvd, Dallas, TX, 75390. Phone: (214) 645-4673. Providers update this record themselves, so call before visiting.

How can I verify Siayareh Rambally, M.D.'s license?

NPPES lists Texas license number N5959, 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 Siayareh Rambally, M.D. prescribe under Medicare Part D?

In 2024, Siayareh Rambally, M.D. had 391 Medicare Part D claims for 70 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.

What is Siayareh Rambally, M.D.'s MIPS final score?

The 2023 MIPS final score is 74.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.

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.

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.