MAE ANTOINETTE LEEF
NPI 1538862727
Internal Medicine - Critical Care Medicine in Park Ridge, IL
NPI Status: Active since March 24, 2023
Contact Information
1775 BALLARD RD
PARK RIDGE, IL
ZIP 60068
Phone: (847) 318-9340
Fax: (847) 318-2966
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Female
- Internal Medicine
- Critical Care Medicine
About MAE LEEF
This page provides the complete NPI Profile along with additional information for Mae Leef, an internist established in Park Ridge, Illinois with a medical specialization in Internal Medicine, focusing in critical care medicine . The healthcare provider is registered in the NPI registry with number 1538862727 assigned on March 2023. The practitioner's primary taxonomy code is 207RC0200X with license number 036179366 (IL). The provider is registered as an individual and her NPI record was last updated June 2026.
- NPI
- 1538862727
- Provider Name
- MAE ANTOINETTE LEEF
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 1775 BALLARD RD PARK RIDGE, IL 60068
- Location Phone
- (847) 318-9340
- Location Fax
- (847) 318-2966
- Mailing Address
- 1775 BALLARD RD PARK RIDGE, IL 60068
- Mailing Phone
- (847) 318-9340
- Mailing Fax
- (847) 318-2966
- Is Sole Proprietor?
- No
- Enumeration Date
- 03-24-2023
- Last Update Date
- 06-25-2026
- Code Navigator
An internist like Mae Leef is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
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
Internal Medicine Critical Care Medicine
- Taxonomy Code
- 207RC0200X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 036179366
- License State
- IL
- Taxonomy Description
- An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 207R00000X | Allopathic & Osteopathic Physicians | Internal Medicine | 125.081622 (IL) |
| 2 | 207RP1001X | Allopathic & Osteopathic Physicians | Internal Medicine | 036179366 (IL) |
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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 1538862727, we treat the final digit (7) 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 73. The final step is to find the difference between that total and the next multiple of ten (80 - 73 = 7).
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 73 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
PARK RIDGE, IL 60068
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1538862727, enumerated as an "individual" on March 24, 2023.
The provider is located at 1775 BALLARD RD PARK RIDGE, IL 60068 and the phone number is (847) 318-9340.
Internal Medicine with taxonomy code 207RC0200X and a focus in Critical Care Medicine.
