DR. KARL WILLIAM DOERFER MD
NPI 1104245018
Otolaryngology - Otology & Neurotology in Milwaukee, WI
About Dr. Karl William Doerfer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KARL WILLIAM DOERFER MD (NPI 1104245018) is an individual otology & neurotology provider in Milwaukee, Wisconsin, licensed in Wisconsin (64553-20) and active in the NPI registry since April 2014. He is enrolled in Medicare PECOS, is affiliated with Community Memorial Hospital, and maintains a secondary practice location in Milwaukee.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Karl William Doerfer Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Karl Doerfer reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Childrens Specialty Group Inc
- 424 clinicians in this Medicare group
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- 3,983 clinicians in this Medicare group
Menomonee Falls, WI 53051
- Reassigned Medicare billing, Wisconsin enrollment
- 2,294 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Community Memorial Hospital
Acute Care Hospitals · Menomonee Falls, WIFroedtert Memorial Lutheran Hospital
Acute Care Hospitals · Milwaukee, WIMedicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Karl Doerfer's NPI number?
The NPI number for Karl Doerfer is 1104245018. It was assigned to this individual provider in the NPPES registry on April 8, 2014.
Where is Karl Doerfer located?
Karl Doerfer practices at 9200 W Wisconsin Ave Fl 3, Milwaukee, WI 53226. The listed phone number is (414) 805-5580.
What is Karl Doerfer's specialty?
The primary specialty registered for this NPI is Otolaryngology, specializing in Otology & Neurotology, with taxonomy code 207YX0901X.
Is Karl Doerfer enrolled in Medicare?
Yes. Karl Doerfer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Karl Doerfer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karl Doerfer reassigns Medicare benefits to 3 organizations: Children's Specialty Group, Inc. (Milwaukee, WI), The Medical College Of Wisconsin, Inc. (Milwaukee, WI) and Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (Menomonee Falls, WI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Karl Doerfer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karl Doerfer accept?
Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, CareSource (Common Ground Healthcare), HealthPartners and Network Health and 1 other insurer list Karl Doerfer as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Karl Doerfer affiliated with any hospitals?
According to CMS data, Karl Doerfer is affiliated with Community Memorial Hospital and Froedtert Memorial Lutheran Hospital.
When was this NPI record last updated?
The NPPES record for Karl Doerfer was last updated on October 11, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Karl William Doerfer, MD · NPI 1104245018
Otology & Neurotology physician in Milwaukee, Wisconsin. Individual provider, active in the CMS NPPES registry since April 8, 2014.
## Identity
- **NPI:** 1104245018 (Entity type: Individual)
- **Enumerated:** April 8, 2014
- **Primary specialty:** Otolaryngology - Otology & Neurotology · taxonomy 207YX0901X
- **State license:** 64553-20 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 9200 W WISCONSIN AVE FL 3, Milwaukee, WI 53226-3522
- **Phone:** (414) 805-5580 · **Fax:** (414) 476-4701
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Children's Specialty Group, Inc. (NPI 1942970405, Milwaukee, WI); The Medical College Of Wisconsin, Inc. (NPI 1699720086, Milwaukee, WI); Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (NPI 1568787448, Menomonee Falls, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** October 11, 2022
- **Other identifiers:** Medicaid 11042245018 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1104245018) · Data from the CMS NPPES public registry.