Quick answers
- Does Holly M. Day accept Medicare assignment?
- Yes. Medicare's clinician data says Holly M. Day accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Holly M. Day see?
- In 2024, CMS data shows 72 Original Medicare patients and 210 services for Holly M. Day. This counts Original Medicare only and measures volume, not quality.
- What is Holly M. Day's NPI number?
- 1235516329. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Holly M. Day, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 72 |
|---|---|
| Services billed to Medicare | 210 |
| Different services or procedures | 16 |
| Participating Medicare provider | Yes |
| Average age of these patients | 66 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)104 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)35 services
- Aspiration of fluid from chest cavity using imaging guidance (32555)16 services
- Hospital discharge day management, more than 30 minutes (99239)13 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol71%
- Chronic kidney disease63%
- Diabetes56%
- Depression44%
- Anxiety44%
Hospitals where Holly M. Day works
Medicare's Facility Affiliation Data lists Holly M. Day at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- University Health SystemSan Antonio, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450213
Practice locations
Addresses where Holly M. Day is enrolled with Medicare (CMS data updated October 2, 2026).
- 4502 Medical DrSan Antonio, TX 78229 (210) 358‑4000
- 7703 Floyd Curl DrSan Antonio, TX 78229 (210) 450‑9000
Group practices
Medicare enrollment lists Holly M. Day as a member of this group (CMS data updated October 2, 2026).
- University of Texas Health Science Center at San Antonio1,297 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in San Antonio
Clinicians with the same Medicare primary specialty in San Antonio, TX — not a recommendation.
Other clinicians in University of Texas Health Science Center at San Antonio
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235516329 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians