DR. MARK C WEISSLER MD
NPI 1962503649
Otolaryngology in Chapel Hill, NC

Q: What is the provider's specialty?

The provider's specialty is Otolaryngology with taxonomy code 207Y00000X.

NPI Status: Active since September 26, 2006

Contact Information

101 MANNING DR
CHAPEL HILL, NC
ZIP 27599
Phone: (919) 966-8596
Fax: (919) 843-5515

NPPES record last updated: March 30, 2021. Verified against the NPPES registry weekly; last sync: July 12, 2026.

Record update history: Mar 30, 2021, Oct 23, 2018 (2 updates tracked since 2018).

Table of Contents

NPI Profile Information
Primary Taxonomy
Insurance Plans Accepted
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Otolaryngology

About MARK WEISSLER

This page provides the complete NPI Profile along with additional information for Mark Weissler, a provider established in Chapel Hill, North Carolina with a medical specialization in Otolaryngology. The healthcare provider is registered in the NPI registry with number 1962503649 assigned on September 2006. The practitioner's primary taxonomy code is 207Y00000X with license number 30515 (NC). The provider is registered as an individual and his NPI record was last updated 5 years ago.

NPI: 1962503649
Provider Name: DR. MARK C WEISSLER MD
Gender: Male
Entity Type: Individual
Location Address: 101 MANNING DR CHAPEL HILL, NC 27599
Location Phone: (919) 966-8596
Location Fax: (919) 843-5515
Mailing Address: 101 MANNING DRIVE CB # 7070 CHAPEL HILL, NC 27514
Mailing Phone: (919) 843-3342
Is Sole Proprietor?: No
Enumeration Date: 09-26-2006
Last Update Date: 03-30-2021
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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: Otolaryngology
Taxonomy Code: 207Y00000X
Type: Allopathic & Osteopathic Physicians
License No.: 30515
License State: NC
Taxonomy Description: An otolaryngologist-head and neck surgeon provides comprehensive medical and surgical care for patients with diseases and disorders that affect the ears, nose, throat, the respiratory and upper alimentary systems and related structures of the head and neck. An otolaryngologist diagnoses and provides medical and/or surgical therapy or prevention of diseases, allergies, neoplasms, deformities, disorders and/or injuries of the ears, nose, sinuses, throat, respiratory and upper alimentary systems, face, jaws and the other head and neck systems. Head and neck oncology, facial plastic and reconstructive surgery and the treatment of disorders of hearing and voice are fundamental areas of expertise.

Insurance Plans Accepted

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

Medicare

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

Medicaid

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
8986355	MEDICAID (05)	NC

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 1962503649, we treat the final digit (9) 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 9).

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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 12 → 1 + 2

Pos 4

Unchanged

Pos 5

Doubled → 10 → 1 + 0

Pos 6

Unchanged

Pos 7

Doubled → 6

Pos 8

Unchanged

Pos 9

Doubled → 8

Check

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 6 → 12 → 3 5 → 10 → 1 3 → 6 4 → 8

Step 2: Add all digits plus the NPI constant

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

2 + 9 + 1 + 2 + 2 + 1 + 0 + 0 + 6 + 6 + 8 + 24 = 61

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

The next multiple of ten after 61 is 70. The difference is the calculated check digit.

70 - 61 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1962503649.