Sarah E Messmer, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

036.145844 Issued in IL

Practice address

840 S Wood St
Room 440 Clinical Sciences North Building
Chicago, IL 60612

Phone

(312) 996-4242

NPI assigned

Jun 9, 2014

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 4

Addresses

Medicare fee-for-service enrollment

Enrolled in IL2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Internal MedicineAlso: Pediatric Medicine

Education

Harvard Medical School, 2014

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

The Board of Trustees of the University of IllinoisGroup PAC ID 3072422716, 1,134 clinicians

Practice addresses (Care Compare)

Merit-based Incentive Payment System (MIPS)

Final score

93.28 of 100Reported as group

Quality

73.53

Promoting interoperability

100

Improvement activities

40

Cost

70.73

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: smessmer17296@uihealth.direct-ci.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• The Board of Trustees of the University of Illinois

  • Anatomic Pathology Physician
  • Chicago, IL
  • NPI 1386863819
  Medicare reassignment Care Compare group NPD
• The Board of Trustees of the University of Illinois

  dba Occupational Health Service Institute (OHSI)

  • Occupational Medicine Physician
  • Chicago, IL
  • NPI 1043727571
  NPD
• The Board of Trustees of the University of Illinois

  • Family Medicine Physician
  • Chicago, IL
  • NPI 1215156344
  NPD
• The Board of Trustees of the University of Illinois

  • Neurology Physician
  • Chicago, IL
  • NPI 1982824660
  NPD
• Board of Trustees of the University of Illinois

  dba Medical Service Plan at Peoria

  • Pediatrics Physician
  • Peoria, IL
  • NPI 1467425322

  Internal Medicine

  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1402272000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761868800000",
    "number": "1073926929",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "840 S WOOD STREET",
            "address_2": "ROOM 440 CLINICAL SCIENCES NORTH BUILDING",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "60612",
            "telephone_number": "312-996-4242"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "840 S WOOD ST",
            "address_2": "ROOM 440 CLINICAL SCIENCES NORTH BUILDING",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "60612",
            "telephone_number": "312-996-4242"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1740 W Taylor St",
            "address_purpose": "LOCATION",
            "city": "Chicago",
            "state": "IL",
            "postal_code": "606127232",
            "country_code": "US",
            "telephone_number": "312-996-7416",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MESSMER",
        "first_name": "SARAH",
        "middle_name": "E",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2014-06-09",
        "last_updated": "2025-10-31",
        "certification_date": "2025-10-31",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RA0401X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Addiction Medicine",
            "state": "IL",
            "license": "036.145844",
            "primary": false
        },
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "MA",
            "license": "L-259415",
            "primary": false
        },
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "IL",
            "license": "036.145844",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "036.145844",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Vince Messina, MA
• Katherine Maria Siciliano Messing, M.D.
• Carly Messinger, PHARMD
• Jacquelynne Walsh Messinger, APN
• Heather Messling, PA-C
• Leonard V Messner, OD
• Stephanie S Messner, OD
• Messy Middle Therapy, PLLC
• Karen Ann Burnett Mestek, PT
• Suha Mestou

• Internal Medicine Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Internal Medicine Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 31, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.