Mary M. Hammack, MD
Internal Medicine Physician · Plano, TX
Mary M. Hammack, MD is an internal medicine physician with a practice address in Plano, Texas, and NPI 1871501874, issued on Aug 4, 2006. Check the license (Texas H6269, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mary M. Hammack
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- H6269 TX
Self-reported in NPPES; status is on the state search - Practice location
- 6124 W Parker RD, Plano, TX 75093
- Phone
- (972) 981-7500
- Enumerated
- Aug 4, 2006
- Record last updated
- Dec 23, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (972) 981-3600
- Medicaid ID
- 116942701 TX
- Medicare enrollment
- Enrolled (PECOS I20050118000563); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At San Antonio, 1988
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 6124 W Parker RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brenda Axmann, M.D.Obstetrics & Gynecology Physician1669421632
- Adnan Badr, M.D.Gastroenterology Physician1770552945
- Michael Blackmon, M.D.Pulmonary Disease Physician1043202849
- Christopher Blewett, M.D.Critical Care Medicine (Internal Medicine) Physician1255357679
- Chandra Brown, MDFamily Medicine Physician1770523821
- Katherine Burr, LSASurgical Assistant1568473742
Verify Mary M. Hammack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license H6269Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,463 Medicare Part D claims for 559 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 202 claims were for opioids.
Most prescribed
- Levothyroxine Sodium573 claims
- Atorvastatin Calcium475 claims
- Escitalopram Oxalate250 claims
- Amlodipine Besylate223 claims
- Losartan Potassium211 claims
- Gabapentin205 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.
Industry payments in 2024: $359.76
18 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
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
- Internal Medicine Associates OF Plano PAPlano, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary M. Hammack among 9,175 internal medicine physician records in Texas
Mary M. Hammack, MD is one of 9,175 internal medicine physician records with a practice address in Texas. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1988 · median 2004 among the 6,088 with a school on file
- Record last updated2008 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
205 internal medicine physician records list a practice address in Plano
They are 205 of the 7,271 NPPES records with a practice address in Plano, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Plano → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Linda Bang, M.D.Plano, TX 750931447243688
- Odette Campbell, M.D.Plano, TX 750931114989092
- Kimberly Crawford, MDPlano, TX 750931417926783
- Marie Dinh, M.D.Plano, TX 750931477518769
- Trung Duong, M.D.Plano, TX 750931841269578
- Safoora Harandi, M.D.Plano, TX 750931134126691
- Linda Krisik, M.D.Plano, TX 750931992782338
- Darius Peikari, MDPlano, TX 750931275590077
Common questions
What is Mary M. Hammack, MD's NPI number?
Mary M. Hammack, MD's National Provider Identifier (NPI) is 1871501874, issued on Aug 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary M. Hammack, MD located?
The NPPES record lists a practice address at 6124 W Parker RD, Plano, TX, 75093. Phone: (972) 981-7500. Providers update this record themselves, so call before visiting.
How can I verify Mary M. Hammack, MD's license?
NPPES lists Texas license number H6269, 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 Mary M. Hammack, MD prescribe under Medicare Part D?
In 2024, Mary M. Hammack, MD had 8,463 Medicare Part D claims for 559 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.
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.