NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Calvin D. Sprik, M.D.

Ophthalmology Physician in Wausau, WI · enumerated 2005.

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

National Provider Identifier

1811970635

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Calvin D. Sprik
Credential M.D.
Sex Male
Practice address 800 N 1st St, Wausau, WI, 54403
Phone (715) 261-8500
Fax (715) 261-8667
Enumeration date Nov 25, 2005
Last updated in NPPES Mar 13, 2015

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 38943 (WI) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
MD-31013 Other IA MEDICAL LICENSE
001639155 Other WI MEDICARE
29416 Other MN MEDICAL LICENSE
35.088385 Other OH MEDICAL LICENSE
38943-20 Other WI WI MEDICAL LICENSE
1864 Other SD MEDICAL LICENSE
31369700 Medicaid WI -

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

Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Calvin Sprik?
Calvin Sprik is registered in NPPES with the primary taxonomy of Ophthalmology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-03-13.