ANNA MARR WILLIS
NPI 1740121029
Emergency Medicine in Chicago, IL
NPI Status: Active since April 02, 2026
Contact Information
5841 S MARYLAND AVE OFC 5068
CHICAGO, IL
ZIP 60637
Phone: (773) 702-9500
- Individual
- Female
- Emergency Medicine
About ANNA WILLIS
This page provides the complete NPI Profile along with additional information for Anna Willis, a provider established in Chicago, Illinois with a medical specialization in Emergency Medicine. The healthcare provider is registered in the NPI registry with number 1740121029 assigned on April 2026. The practitioner's primary taxonomy code is 207P00000X with license number 125087202 (IL). The provider is registered as an individual and her NPI record was last updated April 2026.
- NPI
- 1740121029
- Provider Name
- ANNA MARR WILLIS
- Other Name
- ANNA TERESE MARR
- Other Name Type
- Former Name (1)
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 5841 S MARYLAND AVE OFC 5068 CHICAGO, IL 60637
- Location Phone
- (773) 702-9500
- Mailing Address
- 180 HARVESTER DR STE 110 BURR RIDGE, IL 60527
- Mailing Phone
- (773) 702-1150
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 04-02-2026
- Last Update Date
- 04-14-2026
- Code Navigator
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Emergency Medicine
- Taxonomy Code
- 207P00000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 125087202
- License State
- IL
- Taxonomy Description
- An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
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NPI NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1740121029, we treat the final digit (9) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 51. The final step is to find the difference between that total and the next multiple of ten (60 - 51 = 9).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 51 is 60. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1740121029, enumerated as an "individual" on April 02, 2026.
The provider is located at 5841 S MARYLAND AVE OFC 5068 CHICAGO, IL 60637 and the phone number is (773) 702-9500.
Emergency Medicine with taxonomy code 207P00000X.
