Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. David Nilsen, D.O.

Orthopaedic Surgery Physician in Janesville, WI · enumerated 2008 · practices at Mercy Health System Corporation.

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

National Provider Identifier

1588811244

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. David Nilsen

Credential D.O.

Sex Male

Practice address 557 N Washington St, Janesville, WI, 53548

Phone (608) 754-6000

Enumeration date Aug 25, 2008

Last updated in NPPES Jun 22, 2026

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License OS013810 (PA) Secondary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 005533 (AZ) Secondary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 1735-321 (WI) Primary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License OT011238 (PA) Secondary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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

How do I verify David Nilsen's NPI record?

Cross-check NPI 1588811244 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1588811244 active?

Yes, as of the latest NPPES snapshot, NPI 1588811244 is active (record last updated 2026-06-22).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-22.