JOHN GRAYHACK MD
NPI 1043205966
Orthopaedic Surgery in Chicago, IL

NPI Status: Active since September 16, 2005

Contact Information

225 E CHICAGO AVE # 69
LURIE CHILDREN'S HOSPITAL OF CHICAGO
CHICAGO, IL
ZIP 60611
Phone: (312) 227-6190
Fax: (312) 227-9404

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Table of Contents

NPI Profile Information
Primary Taxonomy
Insurance Plans Accepted
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Orthopaedic Surgery

About JOHN GRAYHACK

This page provides the complete NPI Profile along with additional information for John Grayhack, a provider established in Chicago, Illinois with a medical specialization in Orthopaedic Surgery. The healthcare provider is registered in the NPI registry with number 1043205966 assigned on September 2005. The practitioner's primary taxonomy code is 207X00000X with license number 036072869 (IL). The provider is registered as an individual and his NPI record was last updated 13 years ago.

NPI: 1043205966
Provider Name: JOHN GRAYHACK MD
Gender: Male
Entity Type: Individual
Location Address: 225 E CHICAGO AVE # 69 LURIE CHILDREN'S HOSPITAL OF CHICAGO CHICAGO, IL 60611
Location Phone: (312) 227-6190
Location Fax: (312) 227-9404
Mailing Address: 225 E CHICAGO AVE # 69 LURIE CHILDREN'S HOSPITAL OF CHICAGO CHICAGO, IL 60611
Mailing Phone: (312) 227-6190
Mailing Fax: (312) 227-9404
Is Sole Proprietor?: No
Enumeration Date: 09-16-2005
Last Update Date: 02-15-2013
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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 No.: 036072869
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.

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

Medicare

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Medicaid

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Blue Cross Blue Shield

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier	Type / Code	Identifier State	Identifier Issuer
82419800	MEDICAID (05)	WI
036072869	MEDICAID (05)	IL
L08859	MEDICARE PIN (08)	IL
1627123	OTHER (01)	IL	BCBS PROVIDER ID
E42137	MEDICARE UPIN (02)	IL

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 1043205966, we treat the final digit (6) 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 54. The final step is to find the difference between that total and the next multiple of ten (60 - 54 = 6).

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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 8

Pos 4

Unchanged

Pos 5

Doubled → 4

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

Pos 8

Unchanged

Pos 9

Doubled → 12 → 1 + 2

Check

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 4 → 8 2 → 4 5 → 10 → 1 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 8 + 3 + 4 + 0 + 1 + 0 + 9 + 1 + 2 + 24 = 54

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

The next multiple of ten after 54 is 60. The difference is the calculated check digit.

60 - 54 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1043205966.