MARK J TRELKA MD
NPI 1720005291
Psychiatry & Neurology - Neurology in Jacksonville, FL

NPI Status: Active since July 17, 2006

Contact Information

NAVAL HOSPITAL JACKSONVILLE 2080 CHILD STREET
JACKSONVILLE, FL
ZIP 32214
Phone: (904) 542-9752

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

Individual
Male
Psychiatry & Neurology
Neurology

About MARK TRELKA

This page provides the complete NPI Profile along with additional information for Mark Trelka, a provider established in Jacksonville, Florida with a medical specialization in Psychiatry & Neurology, focusing in neurology . The healthcare provider is registered in the NPI registry with number 1720005291 assigned on July 2006. The practitioner's primary taxonomy code is 2084N0400X with license number 036082394 (IL). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1720005291
Provider Name: MARK J TRELKA MD
Gender: Male
Entity Type: Individual
Location Address: NAVAL HOSPITAL JACKSONVILLE 2080 CHILD STREET JACKSONVILLE, FL 32214
Location Phone: (904) 542-9752
Mailing Address: NAVAL HOSPITAL JACKSONVILLE 2080 CHILD STREET JACKSONVILLE, FL 32214
Mailing Phone: (904) 542-9752
Is Sole Proprietor?: No
Enumeration Date: 07-17-2006
Last Update Date: 08-06-2025
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: Psychiatry & Neurology Neurology
Taxonomy Code: 2084N0400X
Type: Allopathic & Osteopathic Physicians
License No.: 036082394
License State: IL
Taxonomy Description: A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.

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
036082394	MEDICAID (05)	IL
03905078	OTHER (01)	IL	BLUE CROSS BLUE SHIELD

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 1720005291, we treat the final digit (1) 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 49. The final step is to find the difference between that total and the next multiple of ten (50 - 49 = 1).

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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

Pos 8

Unchanged

Pos 9

Doubled → 18 → 1 + 8

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 2 → 4 0 → 0 5 → 10 → 1 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 + 0 + 0 + 1 + 0 + 2 + 1 + 8 + 24 = 49

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

The next multiple of ten after 49 is 50. The difference is the calculated check digit.

50 - 49 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1720005291.