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JONATHAN GREGORY TLACHAC MD
NPI 1629204078
Anesthesiology in Grafton, WI

Active since May 29, 2009PECOS EnrolledAccepts Medicare Assignment
975 PORT WASHINGTON RD, GRAFTON, WI 53024(262) 329-2135 Get Directions Write a Review

NPPES record last updated: October 9, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 9, 2023, Apr 28, 2022 (2 updates tracked since 2022).

About Jonathan Gregory Tlachac Md NPPES

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

JONATHAN GREGORY TLACHAC MD (NPI 1629204078) is an individual anesthesiology provider in Grafton, Wisconsin, licensed in Wisconsin (54241) and active in the NPI registry since May 2009. He is enrolled in Medicare PECOS, is affiliated with Aurora Medical Ctr Washington County, and maintains a secondary practice location in Milwaukee.

NPPES Registry Identity

NPI1629204078
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameJONATHAN GREGORY TLACHACCredential: MD
Location Address975 PORT WASHINGTON RDGrafton, WI 53024-9201
Mailing AddressPo Box 735044Chicago, IL 60673-5044 · (262) 329-2135
Phone(262) 329-2135
Sole ProprietorNo
Medical School CMSUniversity Of Utah School Of MedicineGraduated 2005
Enumeration DateMay 29, 2009
Last NPPES UpdateOctober 9, 20232 updates tracked since enumeration
NPPES CertifiedOctober 9, 2023
✔ NPI 1629204078 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
Licenses✔ Licensed in WI · 54241✔ Licensed in PA · MD436211
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.
975 PORT WASHINGTON RD, Grafton, WI 53024
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Secondary Practice Location 1

Location 19200 W Wisconsin Ave, DEPARTMENT OF ANESTHESIOLOGYMilwaukee, WI 53226-3522 · Phone (414) 805-8700 · Fax (414) 259-1522

Other Identifiers 1

Medicaid100008639WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource (Common Ground Healthcare).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

Jonathan Gregory Tlachac 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 ID2163575671
PECOS Enrollment IDI20100927001005
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.

Medicare Billing Reassignments

2

Medicare enrollment records show Jonathan Tlachac reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Medical College Of Wisconsin, Inc.
20 mi
Internal Medicine
8701 WATERTOWN PLANK RD
Milwaukee, WI 53226
  • Reassigned Medicare billing, Wisconsin enrollment
  • 3,983 clinicians in this Medicare group
NPI 1699720086 (414) 955-7101
Aurora Medical Group, Inc.
23 mi
Obstetrics & Gynecology
8905 W LINCOLN AVE, SUITE 515
West Allis, WI 53227
  • Reassigned Medicare billing, Wisconsin enrollment
  • 4,609 clinicians in this Medicare group
NPI 1457592735 (414) 328-8650

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

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.

Anesthesia for other procedure on large bowel using an endoscope 00811
Anesthesia for an endoscopic procedure on the large bowel ensures comfort and relaxation during the procedure. You'll be given medication to make you drowsy or asleep, eliminating any discomfort. The medication can be administered through a vein or inhaled.
21 services21 patients

Hospital Affiliations CMS Care Compare 3

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

Aurora Medical Ctr Washington County

Acute Care Hospitals · Hartford, WI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520038
Location1032 E Sumner StHartford, WI 53027 · Washington County
Emergency services

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

Aurora Medical Center

Acute Care Hospitals · Grafton, WI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520207
Location975 Port Washington RoadGrafton, WI 53024 · Ozaukee 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.

ANNE R. HARLEY P.T.
Physical Therapist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1000
MRS. MARGARET AIKINS KEUP APNP
Nurse Practitioner (Acute Care)
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1000
DR. TYLER ANDREW FRISQUE PHARMD
Pharmacist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1600
CAITLIN DERENNE PA
Physician Assistant
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (360) 606-4292
DR. TIMOTHY JARON POW M.D.
Internal Medicine (Interventional Cardiology)
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-8150
REBEKAH L OTTE NP
Nurse Practitioner
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-8150
HAMID ABBAS AFSARI D.O.
Hospitalist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-1000
JESSICA BROOKS RYAN SLP
Speech-Language Pathologist
975 PORT WASHINGTON RD
GRAFTON, WI 53024
Ozaukee County (262) 329-2700

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 Jonathan Tlachac's NPI number?

The NPI number for Jonathan Tlachac is 1629204078. It was assigned to this individual provider in the NPPES registry on May 29, 2009.

Where is Jonathan Tlachac located?

Jonathan Tlachac practices at 975 Port Washington Rd, Grafton, WI 53024. The listed phone number is (262) 329-2135.

What is Jonathan Tlachac's specialty?

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

Is Jonathan Tlachac enrolled in Medicare?

Yes. Jonathan Tlachac 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 Jonathan Tlachac's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Jonathan Tlachac reassigns Medicare benefits to 2 organizations: The Medical College Of Wisconsin, Inc. (Milwaukee, WI) and Aurora Medical Group, Inc. (West Allis, 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 Jonathan Tlachac's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Jonathan Tlachac accept?

Health plans from CareSource (Common Ground Healthcare) list Jonathan Tlachac 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 Jonathan Tlachac affiliated with any hospitals?

According to CMS data, Jonathan Tlachac is affiliated with Aurora Medical Ctr Washington County, Aurora St Lukes Medical Center and Aurora Medical Center.

When was this NPI record last updated?

The NPPES record for Jonathan Tlachac was last updated on October 9, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.