What is Lydia Guthmiller's NPI number?

Lydia Guthmiller's National Provider Identifier (NPI) is 1891933198, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Lydia Guthmiller's specialty?

Lydia Guthmiller is listed in the NPPES registry with a primary specialty of Speech-Language Pathologist (Speech, Language and Hearing Service Providers).

Where is Lydia Guthmiller located?

Lydia Guthmiller's practice location on file with NPPES is 810 State St, Spearfish, SD 57783-2140.

What is Lydia Guthmiller's phone number?

The practice phone number listed in the NPPES registry for Lydia Guthmiller is (605) 645-2420.

Is Lydia Guthmiller's NPI active?

Yes — Lydia Guthmiller's NPI (1891933198) is active in the NPPES registry as of the last update on 2025-11-21.

IndividualActive

Lydia Guthmiller

NPI 1891933198 · Speech-Language Pathologist · Spearfish, SD

Lydia Guthmiller is a Speech-Language Pathologist provider in Spearfish, SD (NPI 1891933198).

Provider details

NPI number: 1891933198
Entity type: Individual
Primary specialty: Speech-Language PathologistSpeech, Language and Hearing Service Providers
Sex: Female
Sole proprietor: Yes

Specialties & taxonomies

Speech-Language PathologistPrimary235Z00000X
Speech, Language and Hearing Service Providers

Profile Score

Detailed profile(79/100 index)

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

Registry tenure38% of score
17 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

810 State St

Spearfish, SD 57783-2140

Phone: (605) 645-2420

Street-level locationGet directions

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Mailing address