Sien Chen, M.D.
NPI 1326452210 · Glaucoma Specialist (Ophthalmology) Physician · Fort Sam Houston, TX
Enrolled with Medicare as Order and Referring Only - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sien Chen, M.D. is a Glaucoma Specialist (Ophthalmology) Physician provider in Fort Sam Houston, TX (NPI 1326452210).
Provider details
- NPI number
- 1326452210
- Entity type
- Individual
- Primary specialty
- Glaucoma Specialist (Ophthalmology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 28779 (NE)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
12 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$232 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1100 Wilford Hall Loop Bldg 4554Jbsa Lackland, TX 78236-5638Phone: (210) 539-9582
Registry dates
- Enumerated
- 2014-06-18
- Last updated
- 2026-02-05
- Certified
- 2026-02-05
Frequently asked questions
- What is Sien Chen's NPI number?
- Sien Chen's National Provider Identifier (NPI) is 1326452210, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sien Chen's specialty?
- Sien Chen is listed in the NPPES registry with a primary specialty of Glaucoma Specialist (Ophthalmology) Physician (Allopathic & Osteopathic Physicians).
- Where is Sien Chen located?
- Sien Chen's practice location on file with NPPES is 3551 Roger Brooke Dr, Fort Sam Houston, TX 78234-4504.
- What is Sien Chen's phone number?
- The practice phone number listed in the NPPES registry for Sien Chen is (210) 539-9582.
- Does Sien Chen accept Medicare?
- Sien Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sien Chen's NPI active?
- Yes — Sien Chen's NPI (1326452210) is active in the NPPES registry as of the last update on 2026-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.