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

LYDIA KAY GUTHMILLER
NPI 1891933198
Speech-Language Pathologist in Spearfish, SD

Q: What is Lydia Guthmiller's NPI number?

The NPI number for Lydia Guthmiller is 1891933198. It was assigned to this individual provider in the NPPES registry on January 26, 2009.

Q: What is Lydia Guthmiller's specialty?

The primary specialty registered for this NPI is Speech-Language Pathologist with taxonomy code 235Z00000X.

Q: When was this NPI record last updated?

The NPPES record for Lydia Guthmiller was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 33 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 January 26, 2009

810 STATE ST, SPEARFISH, SD 57783(605) 645-2420 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 13, 2026, Nov 21, 2025 (2 updates tracked since 2025).

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About Lydia Kay Guthmiller NPPES

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

LYDIA KAY GUTHMILLER (NPI 1891933198) is an individual speech-language pathologist provider in Spearfish, South Dakota and active in the NPI registry since January 2009.

NPPES Registry Identity

NPI1891933198

Entity TypeIndividualFemale

Primary Taxonomy235Z00000X

Provider Legal NameLYDIA KAY GUTHMILLER

Location Address810 STATE STSpearfish, SD 57783-2140

Mailing Address810 State StSpearfish, SD 57783-2140 · (605) 645-2420

Phone(605) 645-2420

Sole ProprietorYes

Enumeration DateJanuary 26, 2009

Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration

NPPES CertifiedJuly 13, 2026

✔ NPI 1891933198 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpeech-Language PathologistSpeech, Language and Hearing Service Providers

Taxonomy Code235Z00000X

Definition

The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.

810 STATE ST, Spearfish, SD 57783

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Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Lydia Guthmiller's NPI number?

The NPI number for Lydia Guthmiller is 1891933198. It was assigned to this individual provider in the NPPES registry on January 26, 2009.

Where is Lydia Guthmiller located?

Lydia Guthmiller practices at 810 State St, Spearfish, SD 57783. The listed phone number is (605) 645-2420.

What is Lydia Guthmiller's specialty?

The primary specialty registered for this NPI is Speech-Language Pathologist with taxonomy code 235Z00000X.

When was this NPI record last updated?

The NPPES record for Lydia Guthmiller was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 33 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.