John Reyes-Castano, M.D.
NPI 1073770145 · Endocrinology, Diabetes & Metabolism Physician · Springfield, VA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1073770145
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 30 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 189 | 55 |
| Methimazole | 143 | 48 |
| Insulin Glargine-Yfgn | 80 | 33 |
| Empagliflozinbrand: Jardiance | 65 | 27 |
| Pen Needle, Diabeticbrand: Ultra-Fine Short Pen Needle | 61 | 31 |
| Insulin Lisprobrand: Humalog | 55 | 19 |
| Liraglutide |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-05-16
- Last updated
- 2022-01-08
- Certified
- 2021-05-31
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.