What is Mark Piechowiak's NPI number?

Mark Piechowiak's National Provider Identifier (NPI) is 1366874380, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Mark Piechowiak's specialty?

Mark Piechowiak is listed in the NPPES registry with a primary specialty of Social Worker (Behavioral Health & Social Service Providers).

Where is Mark Piechowiak located?

Mark Piechowiak's practice location on file with NPPES is 121 Saravanos Rd, Yorkville, IL 60560-5813.

What is Mark Piechowiak's phone number?

The practice phone number listed in the NPPES registry for Mark Piechowiak is (630) 221-7432.

Is Mark Piechowiak's NPI active?

Yes — Mark Piechowiak's NPI (1366874380) is active in the NPPES registry as of the last update on 2026-05-04.

IndividualActive

Mark Piechowiak, MSW

NPI 1366874380 · Social Worker · Yorkville, IL

Mark Piechowiak, MSW is a Social Worker provider in Yorkville, IL (NPI 1366874380).

Provider details

NPI number: 1366874380
Entity type: Individual
Primary specialty: Social WorkerBehavioral Health & Social Service Providers
Credential: MSW
Sex: Male
Sole proprietor: No

Specialties & taxonomies

Social WorkerPrimary104100000X
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
12 yrs in NPPES registry
Profile completeness38% of score
83% 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.

Practice location

121 Saravanos Rd

Yorkville, IL 60560-5813

Phone: (630) 221-7432

Fax: (630) 882-8409

Street-level locationGet directions

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Mailing address