Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JUSTIN T CASTELLOW MD
NPI 1639565344
Pediatrics - Neonatal-Perinatal Medicine in Marshfield, WI

Q: What is Justin Castellow's NPI number?

The NPI number for Justin Castellow is 1639565344. It was assigned to this individual provider in the NPPES registry on April 9, 2015.

Q: What is Justin Castellow's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Neonatal-Perinatal Medicine, with taxonomy code 2080N0001X.

Q: When was this NPI record last updated?

The NPPES record for Justin Castellow was last updated on August 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since April 09, 2015PECOS Enrolled

1000 N OAK AVE, MARSHFIELD, WI 54449(715) 387-5511 Get Directions Write a Review

NPPES record last updated: August 27, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Aug 27, 2026, Aug 19, 2026, Jun 20, 2023 and 4 more (7 updates tracked since 2015).

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About Justin T Castellow Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JUSTIN T CASTELLOW MD (NPI 1639565344) is an individual neonatal-perinatal medicine provider in Marshfield, Wisconsin, licensed in Wisconsin (15512) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS and maintains a secondary practice location in Millcreek.

NPPES Registry Identity

NPI1639565344

Entity TypeIndividualMale

Primary Taxonomy2080N0001X

Provider Legal NameJUSTIN T CASTELLOWCredential: MD

Location Address1000 N OAK AVEMarshfield, WI 54449-5703

Mailing Address1000 N Oak AveMarshfield, WI 54449-5703 · (715) 387-5511

Phone(715) 387-5511

Sole ProprietorNo

Enumeration DateApril 9, 2015

Last NPPES UpdateAugust 27, 20267 updates tracked since enumeration

NPPES CertifiedAugust 27, 2026

✔ NPI 1639565344 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatrics · Neonatal-Perinatal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code2080N0001X

Licenses✔ Licensed in WI · 15512✔ Licensed in VA · 0101264380

Definition

A pediatrician who is the principal care provider for sick newborn infants. Clinical expertise is used for direct patient care and for consulting with obstetrical colleagues to plan for the care of mothers who have high-risk pregnancies.

Also ListedPediatricsTaxonomy 208000000X · License 0101264380 (VA)

1000 N OAK AVE, Marshfield, WI 54449

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Secondary Practice Location 1

Location 11200 E 3900 SMillcreek, UT 84124-1300 · Phone (208) 367-8063 · Fax (208) 367-8067

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Justin T Castellow Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ALISON RAE SAMPSON D.O.

Obstetrics & Gynecology