William Erwin, PH.D.
NPI 1063562684 · Clinical Psychologist · San Antonio, TX
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Erwin, PH.D. is a Clinical Psychologist provider in San Antonio, TX (NPI 1063562684).
Provider details
- NPI number
- 1063562684
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20855 (TX)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
77 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) |
|---|---|---|
| Psychotherapy, 1 Hour90837 | 77 | $147 |
Typical Medicare-allowed amounts for these services range $147–$147 (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
- 2007-01-12
- Last updated
- 2011-01-05
Frequently asked questions
- What is William Erwin's NPI number?
- William Erwin's National Provider Identifier (NPI) is 1063562684, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Erwin's specialty?
- William Erwin is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is William Erwin located?
- William Erwin's practice location on file with NPPES is 14815 San Pedro Ave, San Antonio, TX 78232-3708.
- What is William Erwin's phone number?
- The practice phone number listed in the NPPES registry for William Erwin is (210) 494-1991.
- Does William Erwin accept Medicare?
- William Erwin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Erwin's NPI active?
- Yes — William Erwin's NPI (1063562684) is active in the NPPES registry as of the last update on 2011-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.