Douglas Andrew Isenstein, MD
NPI 1528148400ActiveIndividual· Internal Medicine, Pulmonary Disease· Snellville, GA
Internal Medicine, Pulmonary Disease (MD) in Snellville, Georgia, trained at Georgetown University School of Medicine (class of 1982). Their prescriptions cost Medicare Part D more than their services did: $708,069 for 1,798 claims, against $86,241 paid for services in 2024. Insmed, Inc. was the largest of 18 companies reporting payments in 2025, $748.56 in all, mostly food and beverage.
Overview
| NPI | 1528148400 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 16, 2006 |
| Last updated in NPPES | Oct 15, 2020 |
| Certified by provider | Oct 15, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | 025770 | GA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Pulmonary Disease (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 312 |
|---|---|
| Services billed | 1,504 across 27 procedure codes |
| Paid by Medicare | $86,241 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,798 · 2,374 30-day fills |
|---|---|
| Patients | 306 |
| Total drug cost | $708,069 |
| Generic share | 46% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 1982 |
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Sleep Medicine |
Medical group
- Northeast Georgia Diagnostic Associates and Clinic, LLCDuluth, GA · 81 clinicians
Hospital affiliations
- Northside HospitalAtlanta, GA
- Northside Hospital DuluthDuluth, GA
- Northside Hospital ForsythCumming, GA
- Northside Hospital GwinnettLawrenceville, GA
- Piedmont Eastside Medical CenterSnellville, GA
Industry payments (Open Payments)
- 2025$748.56 · 28 payments from 18 companies
- 2024$434.96 · 20 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Insmed, Inc. | $125.63 | 4 |
| Grifols USA, LLC | $109.18 | 4 |
| Regeneron Healthcare Solutions, Inc. | $75.70 | 2 |
| Pulmonx Corporation | $45.98 | 2 |
| Astrazeneca Pharmaceuticals LP | $45.00 | 2 |
What the 2025 payments were for
- Food and Beverage$748.56 · 28 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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