MARY KATHLEEN MCMAHON LMHC
NPI 1215857487
Counselor - Mental Health in Massapequa Park, NY
NPI Status: Active since July 17, 2026
Contact Information
1035 PARK BLVD STE 2C
MASSAPEQUA PARK, NY
ZIP 11762
Phone: (516) 247-6449
This NPI profile has been added to the NPI registry within the last 30 days.
NPPES record last updated: July 17, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.
- Individual
- Female
- Counselor
- Mental Health
About MARY MCMAHON
This page provides the complete NPI Profile along with additional information for Mary Mcmahon, a provider established in Massapequa Park, New York with a medical specialization in Counselor, focusing in mental health . The healthcare provider is registered in the NPI registry with number 1215857487 assigned on July 2026. The practitioner's primary taxonomy code is 101YM0800X with license number 017914 (NY). The provider is registered as an individual and her NPI record was last updated July 2026.
- NPI
- 1215857487
- Provider Name
- MARY KATHLEEN MCMAHON LMHC
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 1035 PARK BLVD STE 2C MASSAPEQUA PARK, NY 11762
- Location Phone
- (516) 247-6449
- Mailing Address
- 1035 PARK BLVD STE 2C MASSAPEQUA PARK, NY 11762
- Mailing Phone
- (516) 247-6449
- Is Sole Proprietor?
- No
- Enumeration Date
- 07-17-2026
- Last Update Date
- 07-17-2026
- Code Navigator
A mental health counselor like Mary Mcmahon provides treatment to individuals, families, couples, and groups for mental and emotional health issues and relationship problems. Mental health counselors treat clients with a variety of conditions, including anxiety, depression, grief, low self-esteem, stress, and suicidal impulses.
Location Map
Secondary Locations
- 303 5th Ave Rm 905
New York, NY 10016
(516) 247-6449
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
Counselor Mental Health
- Taxonomy Code
- 101YM0800X
- Type
- Behavioral Health & Social Service Providers
- License No.
- 017914
- License State
- NY
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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 1215857487, we treat the final digit (7) 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 63. The final step is to find the difference between that total and the next multiple of ten (70 - 63 = 7).
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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 63 is 70. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1215857487, enumerated as an "individual" on July 17, 2026.
The provider is located at 1035 PARK BLVD STE 2C MASSAPEQUA PARK, NY 11762 and the phone number is (516) 247-6449.
Counselor with taxonomy code 101YM0800X and a focus in Mental Health.
