Christopher Mullany McMackin, MD
NPI 1255345096ActiveIndividual· Internal Medicine· Washington, DC
Internal Medicine (MD) in Washington, District of Columbia, trained at Medical College of Pennsylvania (class of 1984). Their prescriptions cost Medicare Part D more than their services did: $1,993,650 for 4,870 claims, against $131,569 paid for services in 2024. Viiv Healthcare Company was the largest of 26 companies reporting payments in 2025, $3,711 in all, mostly food and beverage.
Overview
| NPI | 1255345096 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 28, 2006 |
| Last updated in NPPES | Oct 22, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 16615 | DC |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (DC); Practitioner - Internal Medicine (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 322 |
|---|---|
| Services billed | 5,316 across 43 procedure codes |
| Paid by Medicare | $131,569 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,870 · 9,666 30-day fills |
|---|---|
| Patients | 345 |
| Total drug cost | $1,993,650 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Medical College of Pennsylvania |
|---|---|
| Graduation year | 1984 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Privia Medical Group, LLCFairfax, VA · 1,533 clinicians
Hospital affiliations
- Sibley Memorial HospitalWashington, DC
- Virginia Hospital CenterArlington, VA
Industry payments (Open Payments)
- 2025$3,711 · 158 payments from 26 companies
- 2024$3,990 · 184 payments from 29 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Viiv Healthcare Company | $800.19 | 28 |
| Gilead Sciences, Inc. | $734.30 | 33 |
| Pfizer Inc. | $284.76 | 16 |
| Theratechnologies Inc. | $204.76 | 7 |
| Abbvie Inc. | $191.37 | 11 |
What the 2025 payments were for
- Food and Beverage$3,711 · 158 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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