Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Margaret Hartig

Individual provider Nurse Practitioner · NPI 1225120033

Margaret Hartig is registered under Certified Registered Nurse Anesthetist (CRNA) in Chicago, Illinois. Qualified in 2016, 10 years ago. Practices with Lawrence Anesthesia Services LLC, a 126-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
10
Licensed in
IL
In the registry since
2006
Specialties on file
2
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Practice location Address checks out

676 N Saint Clair St Ste 10-548
Chicago, IL 60611-2927
Phone: (312) 695-4387
Fax: (312) 695-9013
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 1740 W Taylor St, Chicago, IL 60612-7232 — (866) 600-2273
  • 2800 W 95th St, Evergreen Park, IL 60805-2701 — (708) 422-6200

Specialties & licences

Certified Registered Nurse Anesthetist (primary) Taxonomy 367500000X · Licence 209002435 (IL)
Nurse Practitioner Taxonomy 363L00000X · Licence 041308063 (IL)

Record details

NPI number1225120033
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorNo
NPI enumeratedSeptember 29, 2006
Last updated in NPPESMarch 17, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCERTIFIED REGISTERED NURSE ANESTHETIST (CRNA)
Medical schoolOTHER
Graduated 2016 (10 years in practice)
Group practice Lawrence Anesthesia Services Llc — 126 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients138
Services billed 138 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Lawrence Anesthesia Services LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 126 clinicians in the practice; 12 are shown here.

Other providers in Chicago