Dr. Mary Hammack, MD
What this data tells you about Dr. Hammack
Dr. Mary Hammack is an internal medicine specialist in Plano, TX, with 19 years of NPI registration. Based on federal Medicare data, Dr. Hammack performed 16,081 Medicare services across 7,470 unique beneficiaries.
Between the years covered by Open Payments, Dr. Hammack received a total of $7,730 from 55 pharmaceutical and/or device companies across 530 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in internal medicine. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Hammack is Very High — reflecting how much public federal data is available about this provider. This is not a quality rating. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Management using the results of remote vital sign monitoring per calendar month, each additional 20 minutes | 2,291 | $30 | $85 |
| Chronic care management, additional 20 min/month | 1,696 | $35 | $100 |
| Remote patient monitoring device, 30 days | 1,480 | $36 | $115 |
| Remote patient monitoring management, 20 min/month | 1,438 | $36 | $110 |
| Chronic care management, first 20 min/month | 1,068 | $37 | $49 |
| Office visit, established patient (30-39 min) | 754 | $87 | $143 |
| Basic metabolic blood panel | 657 | $8 | $25 |
| Office visit, established patient (20-29 min) | 639 | $55 | $93 |
| Liver function blood test panel | 590 | $8 | $15 |
| Complete blood count (CBC) with differential | 562 | $8 | $92 |
| Lipid panel (cholesterol and triglycerides) | 555 | $13 | $25 |
| Thyroid stimulating hormone (TSH) test | 507 | $16 | $163 |
| Annual wellness visit, follow-up | 451 | $123 | $192 |
| Automated urinalysis | 421 | $2 | $25 |
| Annual depression screening | 392 | $18 | $21 |
| Electrocardiogram (EKG), 12-lead | 353 | $9 | $21 |
| Annual alcohol misuse screening, 5 to 15 minutes | 340 | $18 | $22 |
| Hemoglobin A1c test (diabetes monitoring) | 329 | $10 | $25 |
| Free thyroxine (T4) test | 217 | $9 | $18 |
| Blood draw (venipuncture) | 194 | $8 | $19 |
| New patient office visit (45-59 min) | 156 | $110 | $253 |
| Bone density scan (DEXA) | 107 | $36 | $51 |
| Ferritin level test (iron stores) | 93 | $13 | $69 |
| Iron level test | 91 | $6 | $25 |
| Iron binding capacity test | 90 | $9 | $38 |
| Flu vaccine, high-dose | 89 | $72 | $100 |
| Flu vaccine administration | 89 | $30 | $78 |
| Prostate cancer screening; prostate specific antigen test (psa) | 83 | $19 | $31 |
| Creatinine test (kidney function) | 76 | $5 | $31 |
| Office visit, established patient, complex (40-54 min) | 50 | $133 | $356 |
| Urinalysis, manual | 30 | $3 | $18 |
| PSA test (prostate cancer screening) | 29 | $18 | $92 |
| Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and | 25 | $40 | $83 |
| Physician or allowed practitioner re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians a | 23 | $30 | $49 |
| Urine microalbumin test (kidney screening) | 18 | $6 | $60 |
| Testosterone (hormone) level, total | 16 | $25 | $101 |
| Uric acid level test | 16 | $4 | $51 |
| Office visit, established patient (10-19 min) | 14 | $26 | $54 |
| Transitional care management services for problem of high complexity | 14 | $206 | $272 |
| Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment | 14 | $150 | $196 |
| Remote monitoring of physiologic parameters, initial set-up and patient education on use of equipment | 13 | $14 | $45 |
| New patient office visit (30-44 min) | 11 | $53 | $126 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
Associated products mentioned in payments ›
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This measures how much public data is available about a provider — not how good they are. How we calculate this →
Summary
Dr. Hammack is a clinical cardiology specialist, with above-average Medicare volume (top 2% in TX), with low-engagement industry engagement in the top 11% of TX peers, with 19 years of NPI registration.
This summary is auto-generated from federal data. It describes data availability and patterns — not clinical quality. Read our methodology →
Frequently Asked Questions
Is Dr. Hammack experienced with management using the results of remote vital sign monitoring per calendar month, each additional 20 minutes?
Does Dr. Hammack receive payments from pharmaceutical companies?
How do Dr. Hammack's costs compare to other internal medicine physicians in Plano?
What does Data Coverage mean?
Is this data up to date?
Explore related providers
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. The Transparency Score measures data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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