NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Martha Arwen Karlstad, M.D.

Psychiatry Physician in Viroqua, WI · enumerated 2009.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1457589954

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Martha Arwen Karlstad
Credential M.D.
Sex Female
Practice address 407 S Main St Ste 400, Viroqua, WI, 54665
Phone (608) 637-3174
Enumeration date Jun 23, 2009
Last updated in NPPES May 30, 2018

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License LL31772 (SC) Secondary
2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 62165 (WI) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Martha Karlstad?
The National Provider Identifier (NPI) for Martha Karlstad is 1457589954, a Type 1 (individual) record in the CMS NPPES registry.
Where does Martha Karlstad practice?
The practice location on file with NPPES is in Viroqua, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-05-30.