What is John Reyes-Castano's NPI number?

John Reyes-Castano's National Provider Identifier (NPI) is 1073770145, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is John Reyes-Castano's specialty?

John Reyes-Castano is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).

Where is John Reyes-Castano located?

John Reyes-Castano's practice location on file with NPPES is 6501 Loisdale Ct, Springfield, VA 22150-1826.

What is John Reyes-Castano's phone number?

The practice phone number listed in the NPPES registry for John Reyes-Castano is (706) 922-1067.

Does John Reyes-Castano accept Medicare?

John Reyes-Castano is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is John Reyes-Castano's NPI active?

Yes — John Reyes-Castano's NPI (1073770145) is active in the NPPES registry as of the last update on 2022-01-08.

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John Reyes-Castano, M.D.

NPI 1073770145 · Endocrinology, Diabetes & Metabolism Physician · Springfield, VA

John Reyes-Castano, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Springfield, VA (NPI 1073770145).

Provider details

NPI number: 1073770145
Entity type: Individual
Primary specialty: Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
Sole proprietor: Yes

Practice location

6501 Loisdale Ct

Springfield, VA 22150-1826

Phone: (706) 922-1067

Fax: (703) 922-1041

Street-level locationGet directions

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Mailing address

6501 Loisdale Ct

Springfield, VA 22150-1826

Specialties & taxonomies

Endocrinology, Diabetes & Metabolism PhysicianPrimary207RE0101XLicense MD038927 (DC)
Allopathic & Osteopathic Physicians
Student in an Organized Health Care Education/Training Program390200000X
Student, Health Care

Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Detailed profile(81/100 index)

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
Liraglutidebrand: Victoza 2-Pak	44	15
Testosterone	40	—
Metformin Hcl

Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do not include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.

Enumerated: 2008-05-16
Last updated: 2022-01-08
Certified: 2021-05-31

Frequently asked questions

What is John Reyes-Castano's NPI number?: John Reyes-Castano's National Provider Identifier (NPI) is 1073770145, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is John Reyes-Castano's specialty?: John Reyes-Castano is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
Where is John Reyes-Castano located?: John Reyes-Castano's practice location on file with NPPES is 6501 Loisdale Ct, Springfield, VA 22150-1826.
What is John Reyes-Castano's phone number?: The practice phone number listed in the NPPES registry for John Reyes-Castano is (706) 922-1067.
Does John Reyes-Castano accept Medicare?: John Reyes-Castano is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is John Reyes-Castano's NPI active?: Yes — John Reyes-Castano's NPI (1073770145) is active in the NPPES registry as of the last update on 2022-01-08.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider prescribes (Medicare Part D)

Registry dates

Frequently asked questions

Specialties & taxonomies

Frequently asked questions

Profile Score

What this provider prescribes (Medicare Part D)