TESSA RAE BARCLAY MD
NPI 1699237651
Pediatrics - Pediatric Infectious Diseases in Pittsburgh, PA

NPI Status: Active since April 01, 2019

Contact Information

3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA
ZIP 15213
Phone: (412) 647-7228

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  • Individual
  • Female
  • Years of Experience 7
  • Pediatrics
  • Pediatric Infectious Diseases
  • May Accept Medicare Approved Payment
  • PECOS Enrolled

About TESSA BARCLAY

This page provides the complete NPI Profile along with additional information for Tessa Barclay, a pediatrician established in Pittsburgh, Pennsylvania with a medical specialization in Pediatrics, focusing in pediatric infectious diseases and more than 7 years of experience. She graduated from University Of Vermont College Of Medicine in 2019. The healthcare provider is registered in the NPI registry with number 1699237651 assigned on April 2019. The practitioner's primary taxonomy code is 2080P0208X with license number MD489660 (PA). The provider is registered as an individual and her NPI record was last updated February 2026.

NPI
1699237651
Provider Name
TESSA RAE BARCLAY MD
Gender
Female
Entity Type
Individual
Location Address
3601 5TH AVE BLDG SUITE700 PITTSBURGH, PA 15213
Location Phone
(412) 647-7228
Mailing Address
2 HOT METAL ST BLDG 3 PITTSBURGH, PA 15203
Medical School Name
UNIVERSITY OF VERMONT COLLEGE OF MEDICINE
Graduation Year
2019
Is Sole Proprietor?
No
Enumeration Date
04-01-2019
Last Update Date
02-02-2026
Code Navigator

A pediatrician like Tessa Barclay is a physician who has completed a pediatric residency and is board-certified or board-eligible in a pediatric specialty. Pediatric care providers are trained to care for newborns, infants, children and adolescents. A pediatrician could perform physical exams, manage vaccinations, monitor development milestones, diagnose illnesses, infections, injuries or other health problems, etc.

Location Map

Secondary Locations

  • 5555 W Thunderbird Rd
    Glendale, AZ 85306
    (602) 865-5561
  • 1400 S Dobson Rd
    Mesa, AZ 85202
    (480) 412-3000

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

Pediatrics Pediatric Infectious Diseases

Taxonomy Code
2080P0208X
Type
Allopathic & Osteopathic Physicians
License No.
MD489660
License State
PA
Taxonomy Description
A pediatrician trained to care for children in the diagnosis, treatment and prevention of infectious diseases. This specialist can apply specific knowledge to affect a better outcome for pediatric infections with complicated courses, underlying diseases that predispose to unusual or severe infections, unclear diagnoses, uncommon diseases and complex or investigational treatments.

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)
12080P0208XAllopathic & Osteopathic Physicians

Pediatrics
Pediatric Infectious Diseases

77365 (AZ)

Medicare Participation & PECOS Enrollment Status

Tessa Barclay is registered with Medicare but maybe doesn't accept claims assignment. If you are a Medicare beneficiary call and confirm with the provider before seeking any services.

Tessa Barclay 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: 4486155058

    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: I20250827001988, I20250905002511

    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? Maybe

    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

Reviews for TESSA RAE BARCLAY MD

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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 1699237651, we treat the final digit (1) 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 1).

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
6
Unchanged
Pos 3
9
Doubled → 18 → 1 + 8
Pos 4
9
Unchanged
Pos 5
2
Doubled → 4
Pos 6
3
Unchanged
Pos 7
7
Doubled → 14 → 1 + 4
Pos 8
6
Unchanged
Pos 9
5
Doubled → 10 → 1 + 0
Check
1
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 9 → 18 → 9 2 → 4 7 → 14 → 5 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 1 + 8 + 9 + 4 + 3 + 1 + 4 + 6 + 1 + 0 + 24 = 69

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

The next multiple of ten after 69 is 70. The difference is the calculated check digit.

70 - 69 = 1
This NPI is valid
The calculated check digit is 1, which matches the last digit of 1699237651.

Other Providers at the Same Location


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

Internal Medicine (Infectious Disease)
3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA 15213
Internal Medicine (Infectious Disease)
3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA 15213
Internal Medicine
3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA 15213
Internal Medicine (Infectious Disease)
3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA 15213
Internal Medicine (Infectious Disease)
3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA 15213
Internal Medicine (Infectious Disease)
3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA 15213
Internal Medicine (Infectious Disease)
3601 5TH AVE BLDG SUITE700
PITTSBURGH, PA 15213

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1699237651, enumerated as an "individual" on April 01, 2019.

The provider is located at 3601 5TH AVE BLDG SUITE700 PITTSBURGH, PA 15213 and the phone number is (412) 647-7228.

Pediatrics with taxonomy code 2080P0208X and a focus in Pediatric Infectious Diseases.