Diego Castellon, MD
NPI 1306331665 · Infectious Disease Physician · San Angelo, TX
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diego Castellon, MD is a Infectious Disease Physician provider in San Angelo, TX (NPI 1306331665).
Provider details
- NPI number
- 1306331665
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
173 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 81 | $86 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 50 | $142 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 26 | $91 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 16 | $54 |
Typical Medicare-allowed amounts for these services range $54–$142 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-06-28
- Last updated
- 2025-06-30
- Certified
- 2025-06-30
Frequently asked questions
- What is Diego Castellon's NPI number?
- Diego Castellon's National Provider Identifier (NPI) is 1306331665, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diego Castellon's specialty?
- Diego Castellon is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Diego Castellon located?
- Diego Castellon's practice location on file with NPPES is 120 E Harris Ave, San Angelo, TX 76903-5904.
- What is Diego Castellon's phone number?
- The practice phone number listed in the NPPES registry for Diego Castellon is (325) 747-6741.
- Does Diego Castellon accept Medicare?
- Diego Castellon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diego Castellon's NPI active?
- Yes — Diego Castellon's NPI (1306331665) is active in the NPPES registry as of the last update on 2025-06-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.