Quick answers
- Does Margaret S. Kwan accept Medicare assignment?
- Medicare's clinician data says Margaret S. Kwan may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Margaret S. Kwan see?
- In 2024, CMS data shows 109 Original Medicare patients and 174 services for Margaret S. Kwan. This counts Original Medicare only and measures volume, not quality.
- What is Margaret S. Kwan's NPI number?
- 1508902545. 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 Margaret S. Kwan, 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 | 109 |
|---|---|
| Services billed to Medicare | 174 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient complete exam of visual system (92014)80 services
- Imaging of retina (92134)48 services
- Established patient problem focused exam of visual system (92012)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 cholesterol73%
- High blood pressure51%
- Arthritis36%
- Ischemic heart disease24%
- Diabetes17%
- Chronic kidney disease17%
Practice locations
Addresses where Margaret S. Kwan is enrolled with Medicare (CMS data updated October 2, 2026).
- 4030 Bissonnet StHouston, TX 77005 (713) 665‑3827
Group practices
Medicare enrollment lists Margaret S. Kwan as a member of this group (CMS data updated October 2, 2026).
- Nancy Stephens Od PLLC2 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 Nancy Stephens Od PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Graduation year | 1980 (46 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1508902545 |
| 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