DR. ALLAN SEYMOUR MALK M.D.
NPI 1720108699
Orthopaedic Surgery in Chicago, IL

NPI Status: Active since April 02, 2007

Contact Information

1901 W HARRISON ST
CHICAGO, IL
ZIP 60612
Phone: (312) 864-6000
Fax: (312) 864-9755

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  • Individual
  • Male
  • Orthopaedic Surgery

About ALLAN MALK

This page provides the complete NPI Profile along with additional information for Allan Malk, a provider established in Chicago, Illinois with a medical specialization in Orthopaedic Surgery. The healthcare provider is registered in the NPI registry with number 1720108699 assigned on April 2007. The practitioner's primary taxonomy code is 207X00000X. The provider is registered as an individual and his NPI record was last updated 19 years ago.

NPI
1720108699
Provider Name
DR. ALLAN SEYMOUR MALK M.D.
Gender
Male
Entity Type
Individual
Location Address
1901 W HARRISON ST CHICAGO, IL 60612
Location Phone
(312) 864-6000
Location Fax
(312) 864-9755
Mailing Address
400 CARRIAGE WAY DEERFIELD, IL 60015
Mailing Phone
(847) 945-0660
Mailing Fax
(312) 864-9755
Is Sole Proprietor?
No
Enumeration Date
04-02-2007
Last Update Date
07-08-2007
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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

Orthopaedic Surgery

Taxonomy Code
207X00000X
Type
Allopathic & Osteopathic Physicians
License State
IL
Taxonomy Description
An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

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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 1720108699, 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 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.

Pos 1
1
Doubled → 2
Pos 2
7
Unchanged
Pos 3
2
Doubled → 4
Pos 4
0
Unchanged
Pos 5
1
Doubled → 2
Pos 6
0
Unchanged
Pos 7
8
Doubled → 16 → 1 + 6
Pos 8
6
Unchanged
Pos 9
9
Doubled → 18 → 1 + 8
Check
9
Target digit
Regular digit Doubled digit Check digit

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.

1 → 2 2 → 4 1 → 2 8 → 16 → 7 9 → 18 → 9

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 7 + 4 + 0 + 2 + 0 + 1 + 6 + 6 + 1 + 8 + 24 = 61

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 61 is 70. The difference is the calculated check digit.

70 - 61 = 9
This NPI is valid
The calculated check digit is 9, which matches the last digit of 1720108699.

Other Providers at the Same Location


The following 20 providers are registered at the same or a nearby location.

Pharmacist (Pharmacotherapy)
1901 W HARRISON ST, LL 170
CHICAGO, IL 60612
Surgery (Surgical Critical Care)
1901 W HARRISON ST, DIVISION OF SURGICAL CRITICAL CARE
CHICAGO, IL 60612
Clinical Nurse Specialist (Adult Health)
1901 W HARRISON ST
CHICAGO, IL 60612
Radiology (Diagnostic Radiology)
1901 W HARRISON ST
CHICAGO, IL 60612
Specialist
1901 W HARRISON ST
CHICAGO, IL 60612
Radiology (Diagnostic Radiology)
1901 W HARRISON ST, ROOM 2533
CHICAGO, IL 60612
Nurse Practitioner (Adult Health)
1901 W HARRISON ST, 2ND FLOOR, GENERAL MEDICINE CLINIC
CHICAGO, IL 60612
Radiology (Diagnostic Radiology)
1901 W HARRISON ST, JOHN H. STROGER, JR. HOSPITAL OF COOK COUNTY
CHICAGO, IL 60612
Radiology (Therapeutic Radiology)
1901 W HARRISON ST, STROGER HOSPITAL OF COOK COUNTY
CHICAGO, IL 60612
Internal Medicine (Endocrinology, Diabetes & Metabolism)
1901 W HARRISON ST
CHICAGO, IL 60612
Nurse Practitioner (Adult Health)
1901 W HARRISON ST, SUITE NO 215, 637 S WOOD ST
CHICAGO, IL 60612
Internal Medicine
1901 W HARRISON ST, JOHN H. STROGER, JR. HOSPITAL OF COOK COUNTY
CHICAGO, IL 60612
Internal Medicine
1901 W HARRISON ST, JOHN H. STROGER JR HOSPITAL OF COOK COUNTY
CHICAGO, IL 60612
Pediatrics (Pediatric Emergency Medicine)
1901 W HARRISON ST, JOHN H. STROGER JR. HOSPITAL, DEPARTMENT OF PEDIATRICS
CHICAGO, IL 60612
Internal Medicine (Geriatric Medicine)
1901 W HARRISON ST
CHICAGO, IL 60612
Nurse Practitioner (Adult Health)
1901 W HARRISON ST
CHICAGO, IL 60612
Pediatrics
1901 W HARRISON ST
CHICAGO, IL 60612
Internal Medicine
1901 W HARRISON ST, JOHN H. STROGER JR. HOSPITAL OF COOK COUNTY
CHICAGO, IL 60612
Radiology (Diagnostic Radiology)
1901 W HARRISON ST, RM 2533
CHICAGO, IL 60612
Podiatrist
1901 W HARRISON ST
CHICAGO, IL 60612

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1720108699, enumerated as an "individual" on April 02, 2007.

The provider is located at 1901 W HARRISON ST CHICAGO, IL 60612 and the phone number is (312) 864-6000.

Orthopaedic Surgery with taxonomy code 207X00000X.