Quick answers
- Does Johanna M. Messerly accept Medicare assignment?
- Yes. Medicare's clinician data says Johanna M. Messerly 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 Johanna M. Messerly see?
- In 2024, CMS data shows 39 Original Medicare patients and 465 services for Johanna M. Messerly. This counts Original Medicare only and measures volume, not quality.
- What is Johanna M. Messerly's NPI number?
- 1619520681. 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 Johanna M. Messerly, 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 | 39 |
|---|---|
| Services billed to Medicare | 465 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Administration of psychological or neuropsychological test by technician, each additional 30 minutes (96139)204 services
- Evaluation of neuropsychological test, each additional hour (96133)92 services
- Exam of neurobehavioral status, first hour (96116)35 services
- Evaluation of neuropsychological test, first hour (96132)34 services
- Administration of psychological or neuropsychological test by technician, first 30 minutes (96138)33 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 pressure67%
- High cholesterol64%
- Depression46%
- Anxiety38%
- Alzheimer's disease or dementia36%
Hospitals where Johanna M. Messerly works
Medicare's Facility Affiliation Data lists Johanna M. Messerly 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.
- UT Health San Antonio Multispecialty & Research HoSan Antonio, TX · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 670335
Practice locations
Addresses where Johanna M. Messerly is enrolled with Medicare (CMS data updated October 2, 2026).
- 8300 Floyd Curl DrSan Antonio, TX 78229 (210) 450‑9000
Group practices
Medicare enrollment lists Johanna M. Messerly 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
- Clinical Psychologistprimary
Other clinical psychologists 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 | NP |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1619520681 |
| 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