What is Sofya Zak's NPI number?

Sofya Zak's National Provider Identifier (NPI) is 1699483990, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Sofya Zak's specialty?

Sofya Zak is listed in the NPPES registry with a primary specialty of Pediatric Nephrology Physician (Allopathic & Osteopathic Physicians).

Where is Sofya Zak located?

Sofya Zak's practice location on file with NPPES is 225 E Chicago Ave, Chicago, IL 60611-2991.

What is Sofya Zak's phone number?

The practice phone number listed in the NPPES registry for Sofya Zak is (800) 543-7362.

Does Sofya Zak accept Medicare?

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

Is Sofya Zak's NPI active?

Yes — Sofya Zak's NPI (1699483990) is active in the NPPES registry as of the last update on 2022-11-07.

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Sofya Zak, APRN

NPI 1699483990 · Pediatric Nephrology Physician · Chicago, IL

Sofya Zak, APRN is a Pediatric Nephrology Physician provider in Chicago, IL (NPI 1699483990).

Provider details

NPI number: 1699483990
Entity type: Individual
Primary specialty: Pediatric Nephrology PhysicianAllopathic & Osteopathic Physicians
Credential: APRN
Sex: Female
Sole proprietor: No
License: 209026067 (IL)

Practice location

225 E Chicago Ave

Chicago, IL 60611-2991

Phone: (800) 543-7362

Street-level locationGet directions

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Mailing address

400 E Randolph St Apt 3412

Chicago, IL 60601-7308

Specialties & taxonomies

Pediatric Nephrology PhysicianPrimary2080P0210XLicense 209026067 (IL)
Allopathic & Osteopathic Physicians

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

Profile Score

Established profile(60/100 index)

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

Registry tenure38% of score
4 yrs in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

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.

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.

Drug	Part D claims (2024)
Tacrolimus	22
Amlodipine Benzoatebrand: Katerzia	11
Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim	11

Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do not include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.

Enumerated: 2022-11-07
Last updated: 2022-11-07
Certified: 2022-11-07

Frequently asked questions

What is Sofya Zak's NPI number?: Sofya Zak's National Provider Identifier (NPI) is 1699483990, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Sofya Zak's specialty?: Sofya Zak is listed in the NPPES registry with a primary specialty of Pediatric Nephrology Physician (Allopathic & Osteopathic Physicians).
Where is Sofya Zak located?: Sofya Zak's practice location on file with NPPES is 225 E Chicago Ave, Chicago, IL 60611-2991.
What is Sofya Zak's phone number?: The practice phone number listed in the NPPES registry for Sofya Zak is (800) 543-7362.
Does Sofya Zak accept Medicare?: Sofya Zak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Sofya Zak's NPI active?: Yes — Sofya Zak's NPI (1699483990) is active in the NPPES registry as of the last update on 2022-11-07.

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

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider prescribes (Medicare Part D)

Registry dates

Frequently asked questions

Specialties & taxonomies

Profile Score

What this provider prescribes (Medicare Part D)

Frequently asked questions