GREGORY MING TIAO MD
NPI 1083794036
Surgery in Palo Alto, CA

NPI Status: Active since October 16, 2006

Contact Information

725 WELCH RD
PALO ALTO, CA
ZIP 94304
Phone: (650) 497-8000

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  • Individual
  • Male
  • Years of Experience 36
  • Surgery
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About GREGORY TIAO

This page provides the complete NPI Profile along with additional information for Gregory Tiao, a provider established in Palo Alto, California with a medical specialization in Surgery and more than 36 years of experience. He graduated from University Of Illinois College Of Med (chi/peor/rock/chm-urb) in 1990. The healthcare provider is registered in the NPI registry with number 1083794036 assigned on October 2006. The practitioner's primary taxonomy code is 208600000X with license number G84888 (CA). The provider is registered as an individual and his NPI record was last updated December 2025.

NPI
1083794036
Provider Name
GREGORY MING TIAO MD
Gender
Male
Entity Type
Individual
Location Address
725 WELCH RD PALO ALTO, CA 94304
Location Phone
(650) 497-8000
Mailing Address
725 WELCH RD PALO ALTO, CA 94304
Mailing Phone
(650) 497-8000
Medical School Name
UNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduation Year
1990
Is Sole Proprietor?
No
Enumeration Date
10-16-2006
Last Update Date
12-15-2025
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A surgeon like Gregory Tiao treats injuries, diseases, and deformities through surgical operations. A surgeon could correct physical deformities, repair bone and tissue, or perform preventive or elective surgeries. Surgeons also examine patients, perform and interpret diagnostic tests, and provide counsel on preventive healthcare.

Location Map

Secondary Locations

  • 3333 Burnet Ave ML 2023
    Cincinnati, OH 45229
    (513) 636-4371

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

Surgery

Taxonomy Code
208600000X
Type
Allopathic & Osteopathic Physicians
License No.
G84888
License State
CA
Taxonomy Description
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1204F00000XAllopathic & Osteopathic Physicians

Transplant Surgery

G84888 (CA)
22086S0120XAllopathic & Osteopathic Physicians

Surgery
Pediatric Surgery

52167 (KY)
32086S0120XAllopathic & Osteopathic Physicians

Surgery
Pediatric Surgery

01081810A (IN)
42086S0120XAllopathic & Osteopathic Physicians

Surgery
Pediatric Surgery

G84888 (CA)
52086S0120XAllopathic & Osteopathic Physicians

Surgery
Pediatric Surgery

35.065006 (OH)

Insurance Plans Accepted

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

  • Bronze 7500 $25 Generic Drugs - HMO
  • Bronze 7500 $25 Generic Drugs + Adult Vision & Fitness - HMO
  • Core Gold 1500 $10 Generic Drugs - HMO
  • Core Gold 1500 $10 Generic Drugs + Adult Vision & Fitness - HMO
  • Diabetes Gold 3000 $0 Chronic Care Drugs & Services - HMO
  • Diabetes Gold 3000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
  • Diabetes Silver 5000 $0 Chronic Care Drugs & Services - HMO
  • Diabetes Silver 5000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
  • Gold 2000 $15 Generic Drugs - HMO
  • Gold 2000 $15 Generic Drugs + Adult Vision & Fitness - HMO
  • HDHP Preventive Silver 5500 $0 Chronic Care Drugs - HMO
  • Healthy Heart Gold 3000 $0 Chronic Care Drugs & Services - HMO
  • Healthy Heart Gold 3000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
  • Healthy Heart Silver 5000 $0 Chronic Care Drugs & Services - HMO
  • Healthy Heart Silver 5000 $0 Chronic Care Drugs & Services + Adult Vision & Fitness - HMO
  • Low Premium Bronze 10600 $25 Generic Drugs - HMO
  • Low Premium Bronze 10600 $25 Generic Drugs + Adult Vision & Fitness - HMO
  • Low Premium Silver 6200 $3 Generic Drugs - HMO
  • Low Premium Silver 6200 $3 Generic Drugs + Adult Vision & Fitness - HMO
  • Silver 6000 $20 Generic Drugs - HMO
  • Bronze $8,300 w/ Adult Dental ON-EX - HMO
  • Bronze $8,300 w/ Virtual & Wellness ON-EX - HMO
  • Bronze HSA $7,300 ON-EX - HMO
  • Bronze Standard w/ Virtual & Wellness - HMO
  • Gold $1,000 w/ Adult Dental ON-EX - HMO
  • Gold $1,000 w/ Virtual & Wellness ON-EX - HMO
  • Gold $500 w/ Virtual & Wellness ON-EX - HMO
  • Gold Standard w/ Virtual & Wellness - HMO
  • Silver $5,000 w/ Adult Dental ON-EX - HMO
  • Silver $5,000 w/ Virtual & Wellness ON-EX - HMO
  • Silver $5,800 w/ Virtual & Wellness ON-EX - HMO
  • Silver Standard w/ Virtual & Wellness - HMO

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

Medicare Participation & PECOS Enrollment Status

Gregory Tiao 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.

Gregory Tiao 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: 840464640

    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: I20111112000072, I20200102000420

    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

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $26.61 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 94304 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99203

  • Average New Patient Price $106.47
  • Minimum New Patient Price $70.37
  • Maximum New Patient Price $206.04
  • Average New Patient Copayment $26.61
  • 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.

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1083794036, we treat the final digit (6) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 64. The final step is to find the difference between that total and the next multiple of ten (70 - 64 = 6).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
0
Unchanged
Pos 3
8
Doubled → 16 → 1 + 6
Pos 4
3
Unchanged
Pos 5
7
Doubled → 14 → 1 + 4
Pos 6
9
Unchanged
Pos 7
4
Doubled → 8
Pos 8
0
Unchanged
Pos 9
3
Doubled → 6
Check
6
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 8 → 16 → 7 7 → 14 → 5 4 → 8 3 → 6

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 0 + 1 + 6 + 3 + 1 + 4 + 9 + 8 + 0 + 6 + 24 = 64

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 64 is 70. The difference is the calculated check digit.

70 - 64 = 6
This NPI is valid
The calculated check digit is 6, which matches the last digit of 1083794036.

Other Providers at the Same Location


The following 20 providers are registered at the same or a nearby location.

Pediatrics (Pediatric Cardiology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Pulmonology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Nephrology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Cardiology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Critical Care Medicine)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Nephrology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Pulmonology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Cardiology)
725 WELCH RD, MC 5500
PALO ALTO, CA 94304
Obstetrics & Gynecology
725 WELCH RD
PALO ALTO, CA 94304
Radiology (Pediatric Radiology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Cardiology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Critical Care Medicine)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics
725 WELCH RD
PALO ALTO, CA 94304
Nurse Practitioner (Pediatrics)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Hematology-Oncology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Neonatal-Perinatal Medicine)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Pediatric Hematology-Oncology)
725 WELCH RD
PALO ALTO, CA 94304
Pediatrics (Neonatal-Perinatal Medicine)
725 WELCH RD
PALO ALTO, CA 94304
Psychiatry & Neurology (Neurology with Special Qualifications in Child Neurology)
725 WELCH RD, LUCILE PACKARD CHILDREN'S HOSPITAL
PALO ALTO, CA 94304

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1083794036, enumerated as an "individual" on October 16, 2006.

The provider is located at 725 WELCH RD PALO ALTO, CA 94304 and the phone number is (650) 497-8000.

Surgery with taxonomy code 208600000X.

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