KATHERINE LEAH HORN
NPI 1003758053
Speech-Language Pathologist in Needham Heights, MA

NPI Status: Active since April 08, 2026

Contact Information

464 HILLSIDE AVE
NEEDHAM HEIGHTS, MA
ZIP 02494
Phone: (781) 400-5305

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  • Individual
  • Female
  • Speech-Language Pathologist

About KATHERINE HORN

This page provides the complete NPI Profile along with additional information for Katherine Horn, a provider established in Needham Heights, Massachusetts with a medical specialization in Speech-language Pathologist. The healthcare provider is registered in the NPI registry with number 1003758053 assigned on April 2026. The practitioner's primary taxonomy code is 235Z00000X. The provider is registered as an individual and her NPI record was last updated April 2026.

NPI
1003758053
Provider Name
KATHERINE LEAH HORN
Gender
Female
Entity Type
Individual
Location Address
464 HILLSIDE AVE NEEDHAM HEIGHTS, MA 02494
Location Phone
(781) 400-5305
Mailing Address
550 VICTORY RD APT 519 QUINCY, MA 02171
Mailing Phone
(781) 400-5305
Is Sole Proprietor?
No
Enumeration Date
04-08-2026
Last Update Date
04-08-2026
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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

Speech-Language Pathologist

Taxonomy Code
235Z00000X
Type
Speech, Language and Hearing Service Providers
Taxonomy Description
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.

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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 1003758053, we treat the final digit (3) 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 47. The final step is to find the difference between that total and the next multiple of ten (50 - 47 = 3).

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
0
Doubled → 0
Pos 4
3
Unchanged
Pos 5
7
Doubled → 14 → 1 + 4
Pos 6
5
Unchanged
Pos 7
8
Doubled → 16 → 1 + 6
Pos 8
0
Unchanged
Pos 9
5
Doubled → 10 → 1 + 0
Check
3
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 0 → 0 7 → 14 → 5 8 → 16 → 7 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 0 + 3 + 1 + 4 + 5 + 1 + 6 + 0 + 1 + 0 + 24 = 47

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

The next multiple of ten after 47 is 50. The difference is the calculated check digit.

50 - 47 = 3
This NPI is valid
The calculated check digit is 3, which matches the last digit of 1003758053.

Other Providers at the Same Location


The following 17 providers are registered at the same or a nearby location.

Ophthalmology
464 HILLSIDE AVE, BOSTON EYE ASSOCIATES PC
BOSTON, MA 02494
Dermatology
464 HILLSIDE AVE, SUITE 303
NEEDHAM, MA 02494
Ophthalmology
464 HILLSIDE AVE, SUITE 205
NEEDHAM, MA 02494
Internal Medicine
464 HILLSIDE AVE, SUITE 304
NEEDHAM, MA 02494
Internal Medicine
464 HILLSIDE AVE, 3RD FLOOR
NEEDHAM, MA 02494
Family Medicine
464 HILLSIDE AVE
NEEDHAM, MA 02494
Optometrist (Corneal and Contact Management)
464 HILLSIDE AVE, SUITE 205
NEEDHAM, MA 02494
Internal Medicine
464 HILLSIDE AVE, SUITE 302
NEEDHAM, MA 02494
Dermatology
464 HILLSIDE AVE, SUITE 404
NEEDHAM, MA 02494
Nurse Practitioner (Family)
464 HILLSIDE AVE, #304
NEEDHAM, MA 02494
Optometrist
464 HILLSIDE AVE, SUITE #205
NEEDHAM, MA 02494
Internal Medicine (Gastroenterology)
464 HILLSIDE AVE, SUITE 201
NEEDHAM, MA 02494
Internal Medicine (Gastroenterology)
464 HILLSIDE AVE, SUITE 201
NEEDHAM, MA 02494
Social Worker (Clinical)
464 HILLSIDE AVE
NEEDHAM, MA 02494
Optometrist (Corneal and Contact Management)
464 HILLSIDE AVE, SUITE 205
NEEDHAM, MA 02494
Ophthalmology
464 HILLSIDE AVE, SUITE 205
NEEDHAM, MA 02494
Durable Medical Equipment & Medical Supplies
464 HILLSIDE AVE, SUITE 205
NEEDHAM, MA 02494

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1003758053, enumerated as an "individual" on April 08, 2026.

The provider is located at 464 HILLSIDE AVE NEEDHAM HEIGHTS, MA 02494 and the phone number is (781) 400-5305.

Speech-Language Pathologist with taxonomy code 235Z00000X.