Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ELIZABETH MATTES NIELSEN MD
NPI 1861842007
Internal Medicine - Pulmonary Disease in Wauwatosa, WI

Q: What is Elizabeth Nielsen's NPI number?

The NPI number for Elizabeth Nielsen is 1861842007. It was assigned to this individual provider in the NPPES registry on June 19, 2016.

Q: What is Elizabeth Nielsen's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Elizabeth Nielsen was last updated on July 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 29 days 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.

Active since June 19, 2016PECOS Enrolled

1155 N HONEY CREEK PKWY, WAUWATOSA, WI 53213(414) 615-5900 Get Directions Write a Review

NPPES record last updated: July 14, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 14, 2026, Jul 21, 2023, Jan 20, 2023 and 3 more (6 updates tracked since 2016).

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About Elizabeth Mattes Nielsen Md NPPES

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

ELIZABETH MATTES NIELSEN MD (NPI 1861842007) is an individual pulmonary disease provider in Wauwatosa, Wisconsin, licensed in Wisconsin (76831) and active in the NPI registry since June 2016. She is enrolled in Medicare PECOS, is affiliated with Waukesha Memorial Hospital, and maintains 3 additional practice locations.

NPPES Registry Identity

NPI1861842007

Entity TypeIndividualFemale

Primary Taxonomy207RP1001X

Provider Legal NameELIZABETH MATTES NIELSENCredential: MD

Location Address1155 N HONEY CREEK PKWYWauwatosa, WI 53213-3189

Mailing AddressPo Box 735044Chicago, IL 60673-5044 · (800) 326-2250

Phone(414) 615-5900

Sole ProprietorYes

Medical School CMSOtherGraduated 2015

Enumeration DateJune 19, 2016

Last NPPES UpdateJuly 14, 20266 updates tracked since enumeration

NPPES CertifiedJuly 14, 2026

✔ NPI 1861842007 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Pulmonary DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RP1001X

Licenses✔ Licensed in WI · 76831✔ Licensed in IL · 036147784

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 125.068567 (IL), 01089069A (IN)

Also ListedInternal Medicine · Critical Care MedicineTaxonomy 207RC0200X · License 036147784 (IL), 76831 (WI)

1155 N HONEY CREEK PKWY, Wauwatosa, WI 53213

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Secondary Practice Locations 3

Location 12300 N Edward StDecatur, IL 62526-4163 · Phone (217) 876-4200 · Fax (217) 876-4209

Location 2725 American AveWaukesha, WI 53188-5031 · Phone (262) 928-3000 · Fax (262) 953-8814

Location 3Memorial Medical Ctr, 701 N First StreetSpringfield, IL 62781-0001 · Phone (217) 545-0193

Other Identifiers 1

Medicaid100243376WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Network Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Elizabeth Mattes Nielsen 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.

PECOS PAC ID7618262338

PECOS Enrollment IDI20230727000954

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 5

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.

Critical care, first 30-74 minutes 99291

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

160 services88 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

91 services52 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

42 services42 patients

Critical care, each additional 30 minutes 99292

Critical care refers to special attention given to patients facing life-threatening conditions. Each additional 30 minutes indicates the extension of this specialized care. This might include close monitoring, medication adjustments, and immediate interventions as needed.

22 services13 patients

Irrigation and suction of lung airways to obtain cells using an endoscope 31624

This is a procedure where a thin, flexible tube called an endoscope is inserted through your mouth into the lungs. A small amount of saline is then introduced to wash the airways. The fluid, along with cells from the lung, is suctioned back for analysis.

16 services16 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Waukesha Memorial Hospital

Acute Care Hospitals · Waukesha, WI

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520008

Location725 American AveWaukesha, WI 53188 · Waukesha County

Emergency services Birthing friendly

Ascension Columbia St Mary's Hospital Milwaukee

Acute Care Hospitals · Milwaukee, WI

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number520051

Location2323 N Lake DrMilwaukee, WI 53211 · Milwaukee County

Emergency services Birthing friendly

Oconomowoc Memorial Hospital

Acute Care Hospitals · Oconomowoc, WI

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520062

Location791 E Summit AveOconomowoc, WI 53066 · Waukesha County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53213 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$123.69 typical visit price

range $53.90 – $163.24

Typical copayment $30.92 (range $13.47 – $40.81)

Most-billed visit code 99204

Established Patient

$95.41 typical visit price

range $17.40 – $133.76

Typical copayment $23.85 (range $4.35 – $33.44)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 14

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

VISITING NURSE ASSOCIATION OF WISCONSIN, INC.

Hospice Care, Community Based