Ryan Charles Mascarenhas, MD
NPI 1710203682ActiveIndividual· Internal Medicine, Nephrology· Highlands Ranch, CO
Internal Medicine, Nephrology (MD) with Denver Nephrologists PC, practicing in Highlands Ranch, Colorado. In 2024 Medicare paid $129,864 for 341 patients, and Part D covered 763 of their prescriptions, 85% of them generic. Calliditas Therapeutics US Inc. was the largest of 17 companies reporting payments in 2025, $1,470 in all, mostly food and beverage. Lists Adventhealth Littleton and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1710203682 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 15, 2010 |
| Last updated in NPPES | Sep 2, 2025 |
| Certified by provider | Sep 2, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | DR.0067742 | CO |
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 - Nephrology (CO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 341 |
|---|---|
| Services billed | 1,406 across 22 procedure codes |
| Paid by Medicare | $129,864 |
Part D prescriptions in 2024
| Prescriptions (claims) | 763 · 1,962 30-day fills |
|---|---|
| Patients | 172 |
| Total drug cost | $160,685 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 2010 |
|---|---|
| Medicare specialty | Nephrology |
| Telehealth | Offers telehealth |
Medical group
- Denver Nephrologists PCDenver, CO · 47 clinicians
Hospital affiliations
- Adventhealth LittletonLittleton, CO
- HCA Healthone Mountain RidgeThornton, CO
- Sky Ridge Medical CenterLone Tree, CO
- Uchealth Highlands Ranch HospitalHighlands Ranch, CO
Other facilities
- Davita East Aurora DialysisDialysis facility · Aurora, CO
- Davita Parker Dialysis CenterDialysis facility · Parker, CO
Industry payments (Open Payments)
- 2025$1,470 · 48 payments from 17 companies
- 2024$3,094 · 37 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calliditas Therapeutics US Inc. | $324.60 | 7 |
| Astrazeneca Pharmaceuticals LP | $178.26 | 10 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $172.99 | 3 |
| Novo Nordisk Inc | $150.18 | 6 |
| Amgen Inc. | $131.41 | 5 |
What the 2025 payments were for
- Food and Beverage$1,470 · 48 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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