DR. MARTIN JOSEPH GRENNAN JR. M.D.
NPI 1861560039
Anesthesiology - Pain Medicine in Youngstown, OH

NPI Status: Active since December 04, 2006

Contact Information

1044 BELMONT AVE
YOUNGSTOWN, OH
ZIP 44504
Phone: (330) 480-3296
Fax: (330) 480-2926

NPI Profile Information
Primary Taxonomy
CLIA Information
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Anesthesiology
Pain Medicine
CLIA Number: 39D0883300
CLIA Cert. Type: Physician Office
CLIA Exp. Date: 06-28-2026

About MARTIN GRENNAN

This page provides the complete NPI Profile along with additional information for Martin Grennan, a provider established in Youngstown, Ohio with a medical specialization in Anesthesiology, focusing in pain medicine . The healthcare provider is registered in the NPI registry with number 1861560039 assigned on December 2006. The practitioner's primary taxonomy code is 207LP2900X with license number 35073744 (OH). The provider is registered as an individual and his NPI record was last updated 19 years ago.

NPI: 1861560039
Provider Name: DR. MARTIN JOSEPH GRENNAN JR. M.D.
Gender: Male
Entity Type: Individual
Location Address: 1044 BELMONT AVE YOUNGSTOWN, OH 44504
Location Phone: (330) 480-3296
Location Fax: (330) 480-2926
Mailing Address: 2601 FOUNTAIN HILLS DR WEXFORD, PA 15090
Mailing Phone: (724) 934-5736
Mailing Fax: (330) 480-2926
Is Sole Proprietor?: No
Enumeration Date: 12-04-2006
Last Update Date: 07-08-2007
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: Anesthesiology Pain Medicine
Taxonomy Code: 207LP2900X
Type: Allopathic & Osteopathic Physicians
License No.: 35073744
License State: OH
Taxonomy Description: An anesthesiologist who provides a high level of care, either as a primary physician or consultant, for patients experiencing problems with acute, chronic and/or cancer pain in both hospital and ambulatory settings. Patient care needs are also coordinated with other specialists.

CLIA Information

The Clinical Laboratory Improvement Amendments (CLIA) of 1988 applies to facilities or sites that test human specimens for health assessment or to diagnose, prevent, or treat disease. The CLIA Program sets standards for clinical laboratory testing and issues certificates. The NPI / CLIA crosswalk information for this NPI number is:

CLIA Number: 39D0883300
Facility Type: Physician Office
Certificate Effective Date: June 29, 2024
Certificate Expiration Date: June 28, 2026
Laboratory Director: DR. MARTIN G. GREGORIO
Certificate Type: Certificate of Waiver
Certificate Type Description: This CLIA certificate is issued to Martin Grennan to perform only waived tests. CLIA defines waived tests as simple tests with a low risk for an incorrect result. Waived tests include certain tests listed in CLIA regulations, tests cleared by the FDA for home use and tests approved by the FDA for waived status and that meet CLIA waiver criteria.

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 1861560039, 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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 12 → 1 + 2

Pos 4

Unchanged

Pos 5

Doubled → 10 → 1 + 0

Pos 6

Unchanged

Pos 7

Doubled → 0

Pos 8

Unchanged

Pos 9

Doubled → 6

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 6 → 12 → 3 5 → 10 → 1 0 → 0 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 1 + 2 + 1 + 1 + 0 + 6 + 0 + 0 + 6 + 24 = 51

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.

60 - 51 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1861560039.