Quick answers
- Does Charles W. Hollas accept Medicare assignment?
- Yes. Medicare's clinician data says Charles W. Hollas 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 Charles W. Hollas see?
- In 2024, CMS data shows 755 Original Medicare patients and 1,074 services for Charles W. Hollas. This counts Original Medicare only and measures volume, not quality.
- What is Charles W. Hollas's NPI number?
- 1831195890. 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 Charles W. Hollas, 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 | 755 |
|---|---|
| Services billed to Medicare | 1,074 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient complete exam of visual system (92014)501 services
- Established patient problem focused exam of visual system (92012)252 services
- New patient complete exam of visual system (92004)125 services
- Exam of visual field with extended testing (92083)64 services
- Imaging of optic nerve (92133)48 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 cholesterol75%
- Arthritis46%
- Diabetes28%
- Ischemic heart disease23%
- Anxiety20%
Practice locations
Addresses where Charles W. Hollas is enrolled with Medicare (CMS data updated October 2, 2026).
- 3100 Weslayan St, Suite 400Houston, TX 77027 (713) 526‑1600
- 605 Medical Ct, Suite 203Brenham, TX 77833 (979) 830‑1444
Group practices
Medicare enrollment lists Charles W. Hollas as a member of this group (CMS data updated October 2, 2026).
- Berkeley Eye Institute, PLLC63 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Houston
Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.
Other clinicians in Berkeley Eye Institute, PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | University Of Houston - College Of Optometry |
| Graduation year | 2000 (26 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831195890 |
| 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
- 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