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DR. MARK ALAN KLAAS M.D.
NPI 1215994298
Internal Medicine - Pulmonary Disease in Waukesha, WI

Active since April 26, 2006
725 AMERICAN AVE, WAUKESHA, WI 53188(262) 928-2391(262) 928-2718 Get Directions Write a Review

NPPES record last updated: November 20, 2009. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Mark Alan Klaas M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK ALAN KLAAS M.D. (NPI 1215994298) is an individual pulmonary disease provider in Waukesha, Wisconsin, licensed in Wisconsin (31805) and active in the NPI registry since April 2006.

NPPES Registry Identity

NPI1215994298
Entity TypeIndividualMale
Primary Taxonomy207RP1001X
Provider Legal NameDR. MARK ALAN KLAASCredential: M.D.
Location Address725 AMERICAN AVEWaukesha, WI 53188-5031
Mailing AddressSouth 36 West 35541 Hwy DDousman, WI 53118 · (262) 965-5531
Phone(262) 928-2391
Fax(262) 928-2718
Sole ProprietorYes
Enumeration DateApril 26, 2006
Last NPPES UpdateNovember 20, 2009
✔ NPI 1215994298 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Pulmonary DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RP1001X
License✔ Licensed in WI · 31805
Definition
An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.
Also ListedInternal MedicineTaxonomy 207R00000X · License 31805 (WI)
Also ListedInternal Medicine · Critical Care MedicineTaxonomy 207RC0200X · License 31805 (WI)
725 AMERICAN AVE, Waukesha, WI 53188
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Other Identifiers 3

Medicaid31797100WI
Medicare UPINF21375
Medicare ID-Type Unspecified68637

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MS. NATASHA JEAN PINKERTON LCSW
Social Worker (Clinical)
725 AMERICAN AVE
WAUKESHA, WI 53188
Waukesha County (262) 928-1000
DR. FRANCISCO PEREZ M.D.
Anesthesiology
725 AMERICAN AVE
WAUKESHA, WI 53188
Waukesha County (262) 544-2011
ANNETTE QUINN NP
Nurse Practitioner (Obstetrics & Gynecology)
725 AMERICAN AVE, PROHEALTH CARE WOMEN'S CENTER
WAUKESHA, WI 53188
Waukesha County (262) 928-3500
ELIZABETH ROSE LEMM PA-C
Physician Assistant
725 AMERICAN AVE
WAUKESHA, WI 53188
Waukesha County (262) 928-1000
DR. JASON GEORGE ULRICHS M.D.
Anesthesiology
725 AMERICAN AVE
WAUKESHA, WI 53188
Waukesha County (262) 787-6700
DAWN MICHELLE GOODREAU NNP-BC, APNP
Nurse Practitioner (Neonatal)
725 AMERICAN AVE
WAUKESHA, WI 53188
Waukesha County (210) 685-0887
KAYLA DAVIS APNP
Nurse Practitioner (Acute Care)
725 AMERICAN AVE
WAUKESHA, WI 53188
Waukesha County (262) 928-1000
DR. ALYSSA JELINEK
Nurse Practitioner (Neonatal)
725 AMERICAN AVE
WAUKESHA, WI 53188
Waukesha County (262) 928-1000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Klaas's NPI number?

The NPI number for Mark Klaas is 1215994298. It was assigned to this individual provider in the NPPES registry on April 26, 2006.

Where is Mark Klaas located?

Mark Klaas practices at 725 American Ave, Waukesha, WI 53188. The listed phone number is (262) 928-2391.

What is Mark Klaas's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.

When was this NPI record last updated?

The NPPES record for Mark Klaas was last updated on November 20, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.