Clay Istre, PA-C
NPI 1811214521 · Physician Assistant · San Antonio, TX
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clay Istre, PA-C is a Physician Assistant provider in San Antonio, TX (NPI 1811214521).
Provider details
- NPI number
- 1811214521
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- Yes
- License
- PA09534 (TX)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 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
123 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 62 | $147 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 61 | $101 |
Typical Medicare-allowed amounts for these services range $101–$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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tramadol Hcl | 49 | 49 |
| Acetaminophen With Codeinebrand: Acetaminophen-Codeine | 37 | 37 |
| Cephalexin | 34 | 34 |
| Cyclobenzaprine Hcl | 32 | 31 |
| Methylprednisolone | 31 | 31 |
| Ondansetronbrand: Ondansetron Odt | 22 | 22 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 22 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-04-21
- Last updated
- 2015-06-26
Frequently asked questions
- What is Clay Istre's NPI number?
- Clay Istre's National Provider Identifier (NPI) is 1811214521, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clay Istre's specialty?
- Clay Istre is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Clay Istre located?
- Clay Istre's practice location on file with NPPES is 16755 Huebner Rd, San Antonio, TX 78248-2342.
- What is Clay Istre's phone number?
- The practice phone number listed in the NPPES registry for Clay Istre is (210) 493-4357.
- Does Clay Istre accept Medicare?
- Clay Istre is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clay Istre's NPI active?
- Yes — Clay Istre's NPI (1811214521) is active in the NPPES registry as of the last update on 2015-06-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.