Mark Alan Klaas, M.D.
Pulmonary Disease Physician · Waukesha, WI
Mark Alan Klaas, M.D. is a pulmonary disease physician with a practice address in Waukesha, Wisconsin, and NPI 1215994298, issued on Apr 26, 2006. Check the license (Wisconsin 31805, as entered in NPPES) on the Wisconsin Medical Examining Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Alan Klaas
- Credential
- M.D.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- 31805 WI
Self-reported in NPPES; status is on the state search - Practice location
- 725 American Ave, Waukesha, WI 53188
- Phone
- (262) 928-2391
- Enumerated
- Apr 26, 2006
- Record last updated
- Nov 20, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (262) 928-2718
- Medicaid ID
- 31797100 WI
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 300 in Wisconsin → Look up another NPI →
Also registered at 725 American Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Zuber Ali, M.D.Cardiovascular Disease Physician1548536204
- Heather AvelloneFamily Nurse Practitioner1114499001
- Mark Bakalars, M.D.Vascular & Interventional Radiology Physician1174518724
- Lisa BakerAdult Health Nurse Practitioner1588973275
- Melissa Becker, PA-CPhysician Assistant1780132944
Verify Mark Alan Klaas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 31805Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Alan Klaas among 300 pulmonary disease physician records in Wisconsin
Mark Alan Klaas, M.D. is one of 300 pulmonary disease physician records with a practice address in Wisconsin. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 49% newer
- In a Medicare fileNo · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 73% of these records are
- Record last updated2009 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in Wisconsin
There are 300 pulmonary disease physician records in Wisconsin. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 300 in Wisconsin → Every provider in Waukesha → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Marjorie Maxwell, RNWaukesha, WI 531881750810784
- Jane Neumann, MDWaukesha, WI 531881548237282
- Donald Strong, M.D.Waukesha, WI 531881114953999
- Steven Leh, MDMilwaukee, WI 532011780790030
- David Rein, MDMilwaukee, WI 532071093765612
- Rula Al-Saghir, M.D.Milwaukee, WI 532091801831086
- Richard Harbecke, M.D.Milwaukee, WI 532091184653255
- Waleed Najeeb, M.D.Glendale, WI 532091407879877
Common questions
What is Mark Alan Klaas, M.D.'s NPI number?
Mark Alan Klaas, M.D.'s National Provider Identifier (NPI) is 1215994298, issued on Apr 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Alan Klaas, M.D. located?
The NPPES record lists a practice address at 725 American Ave, Waukesha, WI, 53188. Phone: (262) 928-2391. Providers update this record themselves, so call before visiting.
How can I verify Mark Alan Klaas, M.D.'s license?
NPPES lists Wisconsin license number 31805, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.