GILLIAN LEE HSIEH MD
NPI 1063765576
Obstetrics & Gynecology in Mountain View, CA

Q: What is Gillian Hsieh's NPI number?

The NPI number for Gillian Hsieh is 1063765576. It was assigned to this individual provider in the NPPES registry on October 22, 2012.

Q: What is Gillian Hsieh's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Q: When was this NPI record last updated?

The NPPES record for Gillian Hsieh was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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 October 22, 2012PECOS EnrolledAccepts Medicare Assignment

2490 HOSPITAL DR STE 111, MOUNTAIN VIEW, CA 94040(650) 934-7520 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Sep 11, 2025, Dec 10, 2018 (2 updates tracked since 2018).

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About Gillian Lee Hsieh Md NPPES

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

GILLIAN LEE HSIEH MD (NPI 1063765576) is an individual obstetrics & gynecology provider in Mountain View, California, licensed in California (A134657) and active in the NPI registry since October 2012. She is enrolled in Medicare PECOS and is a graduate of Baylor College Of Medicine (2011).

NPPES Registry Identity

NPI1063765576

Entity TypeIndividualFemale

Primary Taxonomy207V00000X

Provider Legal NameGILLIAN LEE HSIEHCredential: MD

Location Address2490 HOSPITAL DR STE 111Mountain View, CA 94040-4126

Mailing Address2350 W El Camino Real Fl 2Mountain View, CA 94040-6203

Phone(650) 934-7520

Sole ProprietorNo

Medical School CMSBaylor College Of MedicineGraduated 2011

Enumeration DateOctober 22, 2012

Last NPPES UpdateSeptember 11, 20252 updates tracked since enumeration

✔ NPI 1063765576 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

License✔ Licensed in CA · A134657

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

2490 HOSPITAL DR STE 111, Mountain View, CA 94040

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Other Identifiers 1

OtherBP10039750TX · Texas Physician In Training

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Gillian Lee Hsieh Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5991023327

PECOS Enrollment IDI20150416000170

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.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

104 services88 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

96 services68 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

70 services70 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

54 services49 patients

Imaging of lymph nodes during surgery 38900

Imaging of lymph nodes during surgery involves taking detailed pictures of your lymph nodes to help surgeons see and assess them in real-time. This procedure can aid in detecting disease, guiding treatment, and improving surgical precision.

38 services38 patients

Biopsy and removal of lymph nodes of abdominal cavity using an endoscope 38570

This procedure involves using a thin, flexible tool called an endoscope to examine and remove lymph nodes in the abdominal area. The endoscope is inserted through a small incision. It allows doctors to view and biopsy, or take samples of, any suspicious tissues for further testing.

31 services31 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94040 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

$156.67 typical visit price

range $70.37 – $206.04

Typical copayment $39.16 (range $17.59 – $51.51)

Most-billed visit code 99204

Established Patient

$86.56 typical visit price

range $23.96 – $169.60

Typical copayment $21.64 (range $5.99 – $42.40)

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 7

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

MRS. CASSANDRA MARTIN PA-C

Physician Assistant