SOPHIA CAROLINE GAFFNEY
NPI 1952975435
Counselor in Seattle, WA

Q: What is the provider's specialty?

The provider's specialty is Counselor with taxonomy code 101Y00000X.

NPI Status: Active since May 18, 2021

Contact Information

1600 E OLIVE ST
SEATTLE, WA
ZIP 98122
Phone: (206) 901-2000

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Table of Contents

NPI Profile Information
Primary Taxonomy
Secondary Taxonomies
Secondary Locations
Medicare Participation & PECOS Status
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Female
Counselor
Opted-Out Medicare

About SOPHIA GAFFNEY

This page provides the complete NPI Profile along with additional information for Sophia Gaffney, a provider established in Seattle, Washington with a medical specialization in Counselor. The healthcare provider is registered in the NPI registry with number 1952975435 assigned on May 2021. The practitioner's primary taxonomy code is 101Y00000X with license number MC61361732 (WA). The provider is registered as an individual and her NPI record was last updated 3 years ago.

NPI: 1952975435
Provider Name: SOPHIA CAROLINE GAFFNEY
Gender: Female
Entity Type: Individual
Location Address: 1600 E OLIVE ST SEATTLE, WA 98122
Location Phone: (206) 901-2000
Mailing Address: 6400 SOUTHCENTER BLVD TUKWILA, WA 98188
Mailing Phone: (206) 901-2000
Is Sole Proprietor?: Yes
Enumeration Date: 05-18-2021
Last Update Date: 02-14-2023
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The provider doesn't accept Medicare and has signed an affidavit to be excluded from the Medicare program. If you are a Medicare beneficiary this means a provider can charge whatever they want for services rendered but must follow certain rules to do so. Sophia Gaffney opted out of Medicare effective on 10-15-2025 until 10-15-2027. Opt out periods last for two years and cannot be terminated unless the provider is opting out for the very first time and the affidavit is terminated no later than 90 days after the opt out effective date. Opt-out affidavits might renew automatically renew every two years. The provider opted out of Medicare and cannot order and refer services to other healthcare providers.

Location Map

Secondary Locations

2601 Summit Ave
Everett, WA 98201
(425) 258-2407

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
Taxonomy Code: 101Y00000X
Type: Behavioral Health & Social Service Providers
License No.: MC61361732
License State: WA
Taxonomy Description: A provider who is trained and educated in the performance of behavior health services through interpersonal communications and analysis. Training and education at the specialty level usually requires a master's degree and clinical experience and supervision for licensure or certification.

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)
1	101YA0400X	Behavioral Health & Social Service Providers	Counselor Addiction (Substance Use Disorder)
2	101YM0800X	Behavioral Health & Social Service Providers	Counselor Mental Health
3	390200000X	Student, Health Care	Student in an Organized Health Care Education/Training Program	CO61182273 (WA)

Medicare Participation & PECOS Enrollment Status

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.

Opted-Out of Medicare? Yes
Opt-Out Effective Date: 10-15-2025
Opt-Out End Date: 10-15-2027
Eligible to Order and Refer? No

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 1952975435, we treat the final digit (5) 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 65. The final step is to find the difference between that total and the next multiple of ten (70 - 65 = 5).

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 → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

Pos 8

Unchanged

Pos 9

Doubled → 6

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 5 → 10 → 1 9 → 18 → 9 5 → 10 → 1 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 9 + 1 + 0 + 2 + 1 + 8 + 7 + 1 + 0 + 4 + 6 + 24 = 65

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

The next multiple of ten after 65 is 70. The difference is the calculated check digit.

70 - 65 = 5

This NPI is valid

The calculated check digit is 5, which matches the last digit of 1952975435.