Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

GABRIEL LOK-HYMN SI MD
NPI 1689204810
Anesthesiology - Pediatric Anesthesiology in Chicago, IL

Q: What is Gabriel Si's NPI number?

The NPI number for Gabriel Si is 1689204810. It was assigned to this individual provider in the NPPES registry on January 15, 2020.

Q: What is Gabriel Si's specialty?

The primary specialty registered for this NPI is Anesthesiology, specializing in Pediatric Anesthesiology, with taxonomy code 207LP3000X.

Q: When was this NPI record last updated?

The NPPES record for Gabriel Si was last updated on August 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since January 15, 2020PECOS Enrolled

225 E CHICAGO AVE, CHICAGO, IL 60611(312) 227-4000 Get Directions Write a Review

NPPES record last updated: August 3, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Aug 3, 2026, Apr 28, 2021, Apr 23, 2021 and 1 more (4 updates tracked since 2020).

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About Gabriel Lok-hymn Si Md NPPES

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

GABRIEL LOK-HYMN SI MD (NPI 1689204810) is an individual pediatric anesthesiology provider in Chicago, Illinois, licensed in Illinois (036.171190) and active in the NPI registry since January 2020. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1689204810

Entity TypeIndividualMale

Primary Taxonomy207LP3000X

Provider Legal NameGABRIEL LOK-HYMN SICredential: MD

Location Address225 E CHICAGO AVEChicago, IL 60611-2991

Mailing Address225 E Chicago AveChicago, IL 60611-2991 · (312) 227-4000

Phone(312) 227-4000

Sole ProprietorYes

Enumeration DateJanuary 15, 2020

Last NPPES UpdateAugust 3, 20264 updates tracked since enumeration

NPPES CertifiedAugust 3, 2026

✔ NPI 1689204810 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiology · Pediatric AnesthesiologyAllopathic & Osteopathic Physicians

Taxonomy Code207LP3000X

License✔ Licensed in IL · 036.171190

Definition

An anesthesiologist who has had additional skill and experience in and is primarily concerned with the anesthesia, sedation, and pain management needs of infants and children. A pediatric anesthesiologist generally provides services including the evaluation of complex medical problems in infants and children when surgery is necessary, planning and care for children before and after surgery, pain control, anesthesia and sedation for any procedures out of the operating room such as MRI, CT scan, and radiation therapy.

225 E CHICAGO AVE, Chicago, IL 60611

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Gabriel Lok-hymn Si Md 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 60611 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

$138.86 typical visit price

range $60.08 – $183.39

Typical copayment $34.71 (range $15.02 – $45.84)

Most-billed visit code 99204

Established Patient

$74.80 typical visit price

range $18.97 – $148.12

Typical copayment $18.70 (range $4.74 – $37.03)

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.

BESSEY ELIZABETH JOSE GEEVARGHESE DO

Pediatrics