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DR. SIEN CHEN M.D.
NPI 1326452210
Ophthalmology - Glaucoma Specialist in Fort Sam Houston, TX

Active since June 18, 2014PECOS Enrolled
3551 ROGER BROOKE DR, FORT SAM HOUSTON, TX 78234(210) 539-9582 Get Directions Write a Review

NPPES record last updated: February 5, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Feb 5, 2026, Aug 7, 2021, Jul 22, 2018 and 1 more (4 updates tracked since 2016).

About Dr. Sien Chen M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. SIEN CHEN M.D. (NPI 1326452210) is an individual glaucoma specialist in Fort Sam Houston, Texas, licensed in New York (303514) and active in the NPI registry since June 2014. He is enrolled in Medicare PECOS and maintains a secondary practice location in Jbsa Lackland.

NPPES Registry Identity

NPI1326452210
Entity TypeIndividualMale
Primary Taxonomy207WX0009X
Provider Legal NameDR. SIEN CHENCredential: M.D.
Location Address3551 ROGER BROOKE DRFort Sam Houston, TX 78234-4504
Mailing Address3551 Roger Brooke DrFort Sam Houston, TX 78234-4504 · (210) 539-9582
Phone(210) 539-9582
Sole ProprietorNo
Enumeration DateJune 18, 2014
Last NPPES UpdateFebruary 5, 20264 updates tracked since enumeration
NPPES CertifiedFebruary 5, 2026
✔ NPI 1326452210 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOphthalmology · Glaucoma SpecialistAllopathic & Osteopathic Physicians
Taxonomy Code207WX0009X
License✔ Licensed in NY · 303514
Definition

An ophthalmologist who specializes in the treatment of glaucoma and other disorders related to increased intraocular pressure and optic nerve damage. This specialty involves the medical and surgical treatment of these conditions.

Also ListedOphthalmologyTaxonomy 207W00000X · License 28779 (NE)
3551 ROGER BROOKE DR, Fort Sam Houston, TX 78234
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Secondary Practice Location 1

Location 11100 Wilford Hall Loop Bldg 4554Jbsa Lackland, TX 78236-5638 · Phone (210) 539-9582

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Sien Chen M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78234 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$126.40 typical visit price
range $54.84 – $166.88
Typical copayment $31.60 (range $13.71 – $41.72)
Most-billed visit code 99204
Established Patient
$68.55 typical visit price
range $17.52 – $136.11
Typical copayment $17.13 (range $4.38 – $34.02)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MARK ALAN BARNHARDT D.O.
Pediatrics
3551 ROGER BROOKE DR, DEPARTMENT OF PEDIATRICS/ADOLESCENT MEDICINE
FORT SAM HOUSTON, TX 78234
Bexar County (210) 916-3160
DR. SCOTT JARED BENTLEY D.O.
Pediatrics (Pediatric Cardiology)
3551 ROGER BROOKE DR
FORT SAM HOUSTON, TX 78234
Bexar County (210) 916-4129
TASLIM ALLIBHAI DAWOOD M.D.
Pediatrics (Neonatal-Perinatal Medicine)
3551 ROGER BROOKE DR, NEONATOLOGY
FORT SAM HOUSTON, TX 78234
Bexar County (210) 916-7078
MRS. CHRISTINE DONNA JOHNSON ANP BC
Nurse Practitioner (Primary Care)
3551 ROGER BROOKE DR, DEPARTMENT OF PEDIATRICS/ADOLESCENT MEDICINE
FORT SAM HOUSTON, TX 78234
Bexar County (210) 916-3160
DR. JONATHAN BOY MD
Student in an Organized Health Care Education/Training Program
3551 ROGER BROOKE DR, MCHE/ME
FORT SAM HOUSTON, TX 78234
Bexar County (423) 557-5399
DR. SAMUEL BRYAN MONTGOMERY M.D.
Student in an Organized Health Care Education/Training Program
3551 ROGER BROOKE DR, MCHE-QD(CREDS)
FORT SAM HOUSTON, TX 78234
Bexar County (210) 916-2460
MISS STEPHANIE RAE NIEDZIELSKI OTR/L
Occupational Therapist
3551 ROGER BROOKE DR, MCHE-QD (CREDS)
FORT SAM HOUSTON, TX 78234
Bexar County (210) 808-2237
DR. ANA ELIZABETH MARKELZ MD
Internal Medicine (Infectious Disease)
3551 ROGER BROOKE DR, MCHE-QD, BLDG 3600
FORT SAM HOUSTON, TX 78234
Bexar County (210) 916-5554

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Sien Chen's NPI number?

The NPI number for Sien Chen is 1326452210. It was assigned to this individual provider in the NPPES registry on June 18, 2014.

Where is Sien Chen located?

Sien Chen practices at 3551 Roger Brooke Dr, Fort Sam Houston, TX 78234. The listed phone number is (210) 539-9582.

What is Sien Chen's specialty?

The primary specialty registered for this NPI is Ophthalmology, specializing in Glaucoma Specialist, with taxonomy code 207WX0009X.

Is Sien Chen enrolled in Medicare?

Yes. Sien Chen is registered in the Medicare PECOS enrollment system.

What insurance does Sien Chen accept?

Health plans from Blue Cross and Blue Shield of Texas list Sien Chen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Sien Chen was last updated on February 5, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.