Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Jennifer Michelle Wollack, D.O.

Internal Medicine Physician in Lansing, MI · enumerated 2016 · practices at Washtenaw Medical Pharmacy LLC.

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

National Provider Identifier

1265880140

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Registry record

Entity type Individual (Type 1)

Name Dr. Jennifer Michelle Wollack

Credential D.O.

Sex Female

Practice address Lansing, MI, 48911

Phone (517) 374-7600

Fax (885) 480-9150

Enumeration date Jun 1, 2016

Last updated in NPPES Mar 24, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 5101022728 (MI) Primary

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

What specialty is Jennifer Wollack?

Jennifer Wollack is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-24.