Ann M. Gessner, DO
NPI 1598768269ActiveIndividual· Obstetrics & Gynecology· Ames, IA
Obstetrics & Gynecology (DO) with Doran and Doran PC, practicing in Ames, Iowa. Their prescriptions cost Medicare Part D more than their services did: $15,001 for 159 claims, against $9,104 paid for services in 2024. Biogen, Inc. was the largest of 10 companies reporting payments in 2025, $566.54 in all, mostly food and beverage. Lists Mary Greeley Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1598768269 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 24, 2005 |
| Last updated in NPPES | Aug 20, 2026 |
| Certified by provider | Aug 20, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | #3307 | IA |
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 - Obstetrics/Gynecology (IA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 72 |
|---|---|
| Services billed | 199 across 28 procedure codes |
| Paid by Medicare | $9,104 |
Part D prescriptions in 2024
| Prescriptions (claims) | 159 · 437 30-day fills |
|---|---|
| Patients | 47 |
| Total drug cost | $15,001 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 1996 |
|---|---|
| Medicare specialty | Obstetrics/Gynecology |
Medical group
- Doran and Doran PCAmes, IA · 6 clinicians
Hospital affiliations
- Mary Greeley Medical CenterAmes, IA
- Unitypoint Health - MarshalltownMarshalltown, IA
Industry payments (Open Payments)
- 2025$566.54 · 22 payments from 10 companies
- 2024$522.67 · 26 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Biogen, Inc. | $174.02 | 7 |
| Astellas Pharma US Inc | $144.75 | 3 |
| Pfizer Inc. | $57.32 | 2 |
| Octapharma USA, Inc. | $48.21 | 2 |
| Abbvie Inc. | $44.62 | 2 |
What the 2025 payments were for
- Food and Beverage$467.54 · 21 payments
- Education$99.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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