Charles Dewey McMahon, M.D.
NPI 1639168735ActiveIndividual· Ophthalmology· Colorado Springs, CO
Ophthalmology (M.D.) in Colorado Springs, Colorado, trained at University of Colorado School of Medicine, Denver (class of 1973). Their prescriptions cost Medicare Part D more than their services did: $78,332 for 600 claims, against $48,536 paid for services in 2024. Optos, Inc. was the largest of 3 companies reporting payments in 2025, $46,090 in all, mostly speaking and faculty fees.
Overview
| NPI | 1639168735 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 20, 2005 |
| Last updated in NPPES | Jul 21, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | DR.0018837 | CO |
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 - Ophthalmology (CO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 156 |
|---|---|
| Services billed | 622 across 28 procedure codes |
| Paid by Medicare | $48,536 |
Part D prescriptions in 2024
| Prescriptions (claims) | 600 · 1,135 30-day fills |
|---|---|
| Patients | 164 |
| Total drug cost | $78,332 |
| Generic share | 70% of claims |
Education and affiliations
| Medical school | University of Colorado School of Medicine, Denver |
|---|---|
| Graduation year | 1973 |
| Medicare specialty | Ophthalmology |
| Secondary specialties | Optometry |
Industry payments (Open Payments)
- 2025$46,090 · 3 payments from 3 companies
- 2024$43.52 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Optos, Inc. | $46,052 | 1 |
| Bausch & Lomb Americas Inc. | $23.30 | 1 |
| Abbvie Inc. | $14.49 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$46,052 · 1 payment
- Food and Beverage$37.79 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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