DR. NEIL R GUENTHER M.D.
NPI 1609859404
Anesthesiology in Milwaukee, WI

Active since November 25, 2005PECOS EnrolledAccepts Medicare Assignment
2900 W OKLAHOMA AVE, MILWAUKEE, WI 53215(414) 649-6000 Get Directions Write a Review

NPPES record last updated: December 1, 2025. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Dec 1, 2025, Nov 23, 2021, Jun 25, 2018 (3 updates tracked since 2018).

About Dr. Neil R Guenther M.d. NPPES

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

DR. NEIL R GUENTHER M.D. (NPI 1609859404) is an individual anesthesiology provider in Milwaukee, Wisconsin, licensed in Wisconsin (25937-020) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Aurora St Lukes Medical Center, and is a graduate of Medical College Of Wisconsin (1983).

NPPES Registry Identity

NPI1609859404
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameDR. NEIL R GUENTHERCredential: M.D.
Location Address2900 W OKLAHOMA AVEMilwaukee, WI 53215-4330
Mailing AddressPo Box 735044Chicago, IL 60673-5044 · (800) 326-2250
Sole ProprietorNo
Medical School CMSMedical College Of WisconsinGraduated 1983
Enumeration DateNovember 25, 2005
Last NPPES UpdateDecember 1, 20253 updates tracked since enumeration
NPPES CertifiedDecember 1, 2025
NPI 1609859404 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License Licensed in WI · 25937-020
Definition

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

2900 W OKLAHOMA AVE, Milwaukee, WI 53215

Other Identifiers 2

Other050032383Rail Road Medicare
Medicaid31445000WI

Accepted 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

Dr. Neil R Guenther M.d. 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 ID4385549914
PECOS Enrollment IDI20050124000299
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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
845 services124 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.
83 services74 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
58 services22 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.
16 services13 patients
Insertion of artery tube for blood sampling or infusion through skin 36620
This procedure involves placing a small tube into an artery, usually in the wrist or elbow, to collect blood samples or administer medication. It's done under local anesthesia and is a common, safe practice.
14 services14 patients

Hospital Affiliations CMS Care Compare

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

Aurora St Lukes Medical Center

Acute Care Hospitals · Milwaukee, WI
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520138
Location2900 W Oklahoma AveMilwaukee, WI 53215 · Milwaukee County
Emergency services Birthing friendly

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.

Pharmacist (Pharmacotherapy)
2900 W OKLAHOMA AVE, OUTPATIENT PHARMACY
MILWAUKEE, WI 53215
Emergency Medicine
2900 W OKLAHOMA AVE
MILWAUKEE, WI 53215
Anesthesiology
2900 W OKLAHOMA AVE
MILWAUKEE, WI 53215
Anesthesiology
2900 W OKLAHOMA AVE
MILWAUKEE, WI 53215
Anesthesiology
2900 W OKLAHOMA AVE
MILWAUKEE, WI 53215
Anesthesiology
2900 W OKLAHOMA AVE
MILWAUKEE, WI 53215
Anesthesiology
2900 W OKLAHOMA AVE
MILWAUKEE, WI 53215
Anesthesiology
2900 W OKLAHOMA AVE
MILWAUKEE, WI 53215

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 Neil Guenther's NPI number?

The NPI number for Neil Guenther is 1609859404. It was assigned to this individual provider in the NPPES registry on November 25, 2005.

Where is Neil Guenther located?

Neil Guenther practices at 2900 W Oklahoma Ave, Milwaukee, WI 53215. The listed phone number is (414) 649-6000.

What is Neil Guenther's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Neil Guenther enrolled in Medicare?

Yes. Neil Guenther 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.

What insurance does Neil Guenther accept?

Health plans from CareSource (Common Ground Healthcare) list Neil Guenther 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 Neil Guenther affiliated with any hospitals?

According to CMS data, Neil Guenther is affiliated with Aurora St Lukes Medical Center.

When was this NPI record last updated?

The NPPES record for Neil Guenther was last updated on December 1, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.