What is Thomas Sak's NPI number?

Thomas Sak's National Provider Identifier (NPI) is 1073090239, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Thomas Sak's specialty?

Thomas Sak is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).

Where is Thomas Sak located?

Thomas Sak's practice location on file with NPPES is 1451 Merchant Dr, Algonquin, IL 60102-5917.

What is Thomas Sak's phone number?

The practice phone number listed in the NPPES registry for Thomas Sak is (847) 469-7537.

Does Thomas Sak accept Medicare?

Thomas Sak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Thomas Sak's NPI active?

Yes — Thomas Sak's NPI (1073090239) is active in the NPPES registry as of the last update on 2025-09-23.

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Thomas Sak, PSYD

NPI 1073090239 · Clinical Neuropsychologist · Algonquin, IL

Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Thomas Sak, PSYD is a Clinical Neuropsychologist provider in Algonquin, IL (NPI 1073090239).

Provider details

NPI number: 1073090239
Entity type: Individual
Primary specialty: Clinical NeuropsychologistBehavioral Health & Social Service Providers
Credential: PSYD
Sex: Male
Sole proprietor: No

Specialties & taxonomies

Clinical NeuropsychologistPrimary103G00000X
Behavioral Health & Social Service Providers
Psychologist103T00000X
Behavioral Health & Social Service Providers

Profile Score

Established profile(71/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
8 yrs in NPPES registry
Profile completeness38% of score
83% of core fields populated
Practice footprint23% of score
8 documented practice locations

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

1451 Merchant Dr

Algonquin, IL 60102-5917

Phone: (847) 469-7537

Fax: (847) 469-7540

Street-level locationGet directions

More IL providers

Mailing address

1451 Merchant Dr

Algonquin, IL 60102-5917

Additional practice locations (7)

1531 S Grove Ave Unit 105
Barrington, IL 60010-5250
Phone: (847) 469-7537
Fax: (847) 469-7540
2551 N Clark St Ste 200
Chicago, IL 60614-1798
Phone: (847) 469-7537
Fax: (847) 469-7540
420 Lake Cook Rd Ste 112
Deerfield, IL 60015-4914
Phone: (847) 469-7537
Fax: (847) 469-7540
1603 Orrington Ave Ste 600
Evanston, IL 60201-3860
Phone: (847) 469-7537
Fax: (847) 469-7540
2300 N Barrington Rd Ste 105
Hoffman Estates, IL 60169-2033
Phone: (847) 469-7537
Fax: (847) 469-7540
17w662 Butterfield Rd Ste 302
Oakbrook Terrace, IL 60181-4006
Phone: (847) 469-7537
Fax: (847) 469-7540
2604 Dempster St Ste 407b
Park Ridge, IL 60068-8428
Phone: (847) 469-7537
Fax: (847) 469-7540

Enumerated: 2018-07-20
Last updated: 2025-09-23
Certified: 2025-09-23

Frequently asked questions

What is Thomas Sak's NPI number?: Thomas Sak's National Provider Identifier (NPI) is 1073090239, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Thomas Sak's specialty?: Thomas Sak is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
Where is Thomas Sak located?: Thomas Sak's practice location on file with NPPES is 1451 Merchant Dr, Algonquin, IL 60102-5917.
What is Thomas Sak's phone number?: The practice phone number listed in the NPPES registry for Thomas Sak is (847) 469-7537.
Does Thomas Sak accept Medicare?: Thomas Sak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Thomas Sak's NPI active?: Yes — Thomas Sak's NPI (1073090239) is active in the NPPES registry as of the last update on 2025-09-23.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.