JEFFREY HIMELSTEIN MS
NPI 1669339222
Counselor - Mental Health in Havertown, PA

NPI Status: Active since January 06, 2026

Contact Information

1120 W TOWNSHIP LINE RD STE 101
HAVERTOWN, PA
ZIP 19083
Phone: (267) 571-0383

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

Individual
Male
Counselor
Mental Health

About JEFFREY HIMELSTEIN

This page provides the complete NPI Profile along with additional information for Jeffrey Himelstein, a provider established in Havertown, Pennsylvania with a medical specialization in Counselor, focusing in mental health . The healthcare provider is registered in the NPI registry with number 1669339222 assigned on January 2026. The practitioner's primary taxonomy code is 101YM0800X. The provider is registered as an individual and his NPI record was last updated January 2026.

NPI: 1669339222
Provider Name: JEFFREY HIMELSTEIN MS
Gender: Male
Entity Type: Individual
Location Address: 1120 W TOWNSHIP LINE RD STE 101 HAVERTOWN, PA 19083
Location Phone: (267) 571-0383
Mailing Address: 834 CHESTNUT ST APT 1529 PHILADELPHIA, PA 19107
Mailing Phone: (610) 585-4858
Is Sole Proprietor?: No
Enumeration Date: 01-06-2026
Last Update Date: 01-06-2026
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A mental health counselor like Jeffrey Himelstein 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.

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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 State: PA

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 1669339222, we treat the final digit (2) 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 68. The final step is to find the difference between that total and the next multiple of ten (70 - 68 = 2).

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 → 6

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

Pos 8

Unchanged

Pos 9

Doubled → 4

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 3 → 6 9 → 18 → 9 2 → 4

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 1 + 2 + 9 + 6 + 3 + 1 + 8 + 2 + 4 + 24 = 68

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

The next multiple of ten after 68 is 70. The difference is the calculated check digit.

70 - 68 = 2

This NPI is valid

The calculated check digit is 2, which matches the last digit of 1669339222.