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

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: July 19, 2026.

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

  • Individual
  • Female
  • Years of Experience 16
  • Obstetrics & Gynecology
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About GILLIAN HSIEH

This page provides the complete NPI Profile along with additional information for Gillian Hsieh, a women's health care provider established in Mountain View, California with a medical specialization in Obstetrics & Gynecology and more than 16 years of experience. She graduated from Baylor College Of Medicine in 2011. The healthcare provider is registered in the NPI registry with number 1063765576 assigned on October 2012. The practitioner's primary taxonomy code is 207V00000X with license number A134657 (CA). The provider is registered as an individual and her NPI record was last updated one year ago.

NPI
1063765576 Verify this NPI
Provider Name
GILLIAN LEE HSIEH MD
Gender
Female
Entity Type
Individual
Location Address
2490 HOSPITAL DR STE 111 MOUNTAIN VIEW, CA 94040
Location Phone
(650) 934-7520
Mailing Address
2350 W EL CAMINO REAL FL 2 MOUNTAIN VIEW, CA 94040
Medical School Name
BAYLOR COLLEGE OF MEDICINE
Graduation Year
2011
Is Sole Proprietor?
No
Enumeration Date
10-22-2012
Last Update Date
09-11-2025
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Women's health care providers like Gillian Hsieh treat and diagnose diseases and conditions that affect a woman's physical and emotional health. Women's health professionals come from a variety of different specialties, including obstetrician/gynecologists, general surgeons, perinatologists, physician assistants, nurse practitioners or nurse midwives. A women's health provider might help you with family planning, breast care, pregnancy and child birth, osteoporosis, menopause, heart disease, etc.

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Obstetrics & Gynecology

Taxonomy Code
207V00000X
Type
Allopathic & Osteopathic Physicians
License No.
A134657
License State
CA
Taxonomy Description
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.

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier Type / Code Identifier State Identifier Issuer
BP10039750OTHER (01)TXTEXAS PHYSICIAN IN TRAINING

Medicare Participation & PECOS Enrollment Status

Gillian Hsieh is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Gillian Hsieh is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 5991023327

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20150416000170

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

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

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.

This service was performed 31 times for 31 patients

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

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.

This service was performed 96 times for 68 patients

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

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.

This service was performed 54 times for 49 patients

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

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.

This service was performed 104 times for 88 patients

Imaging of lymph nodes during surgery

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.

This service was performed 38 times for 38 patients

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

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.

This service was performed 70 times for 70 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

This service was performed 12 times for 12 patients

Removal of uterus for removal of growth using an endoscope

This is a procedure where an endoscope, a thin tube with a light and camera, is used to identify and remove a growth in the body. In this case, it requires the removal of the uterus. This is done to ensure your overall health and well-being.

This service was performed 12 times for 12 patients

Removal of uterus, tubes, and/or ovaries through abdomen using an endoscope, 250.0 g or less

This procedure involves the removal of certain internal structures through small incisions in the abdomen, using a special tool called an endoscope. It's performed when these structures are causing health issues. The weight reference (250.0 g or less) relates to the size of the structures being removed.

This service was performed 30 times for 30 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $39.16 for a new patient copayment and $21.64 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 94040 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $156.67
  • Minimum New Patient Price $70.37
  • Maximum New Patient Price $206.04
  • Average New Patient Copayment $39.16
  • Minimum New Patient Copayment $17.59
  • Maximum New Patient Copayment $51.51

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99213

  • Average Established Patient Price $86.56
  • Minimum Established Patient Price $23.96
  • Maximum Established Patient Price $169.6
  • Average Established Patient Copayment $21.64
  • Minimum Established Patient Copayment $5.99
  • Maximum Established Patient Copayment $42.4

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Reviews for GILLIAN LEE HSIEH MD

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Other Providers at the Same Location


The following 7 providers are registered at the same or a nearby location.

Obstetrics & Gynecology (Urogynecology and Reconstructive Pelvic Surgery)
2490 HOSPITAL DR STE 111
MOUNTAIN VIEW, CA 94040
Physician Assistant
2490 HOSPITAL DR STE 111
MOUNTAIN VIEW, CA 94040
Physician Assistant (Surgical)
2490 HOSPITAL DR STE 111
MOUNTAIN VIEW, CA 94040
Physician Assistant (Surgical)
2490 HOSPITAL DR STE 111
MOUNTAIN VIEW, CA 94040
Physician Assistant (Surgical)
2490 HOSPITAL DR STE 111
MOUNTAIN VIEW, CA 94040
Physician Assistant (Surgical)
2490 HOSPITAL DR STE 111
MOUNTAIN VIEW, CA 94040
Physician Assistant
2490 HOSPITAL DR STE 111
MOUNTAIN VIEW, CA 94040

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1063765576, enumerated as an "individual" on October 22, 2012.

The provider is located at 2490 HOSPITAL DR STE 111 MOUNTAIN VIEW, CA 94040 and the phone number is (650) 934-7520.

Obstetrics & Gynecology with taxonomy code 207V00000X.

The provider might be accepting Accepts: Medicare and Medicaid. Please consult your insurance carrier or call the provider to verify.