CALVERT COUNTY HEALTH DEPARTMENT
NPI 1861761868
Public Health or Welfare in Prince Frederick, MD

NPI Status: Active since December 20, 2011

Contact Information

975 SOLOMONS ISLAND RD N
PRINCE FREDERICK, MD
ZIP 20678
Phone: (410) 535-5400
Fax: (410) 535-5285

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

Organization
Public Health or Welfare
CLIA Number: 21D0687437
CLIA Cert. Type: Other
CLIA Exp. Date: 08-08-2027

About CALVERT COUNTY HEALTH DEPARTMENT

This page provides the complete NPI Profile along with additional information for Calvert County Health Department, a provider established in Prince Frederick, Maryland operating as a Public Health Or Welfare. The healthcare provider is registered in the NPI registry with number 1861761868 assigned on December 2011. The practitioner's primary taxonomy code is 251K00000X with license number D50213 (MD). The provider is registered as an organization and their NPI record was last updated 14 years ago. The authorized official of this NPI record is Dr. Laurence B Polsky M.d., M.p.h. (Health Officer)

NPI: 1861761868
Provider Name: CALVERT COUNTY HEALTH DEPARTMENT
Entity Type: Organization
Location Address: 975 SOLOMONS ISLAND RD N PRINCE FREDERICK, MD 20678
Location Phone: (410) 535-5400
Location Fax: (410) 535-5285
Mailing Address: PO BOX 980 PRINCE FREDERICK, MD 20678
Mailing Phone: (410) 535-5400
Mailing Fax: (410) 535-5285
Is Sole Proprietor?: No
Is Organization Subpart?: No
Enumeration Date: 12-20-2011
Last Update Date: 09-14-2012
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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: Public Health or Welfare
Taxonomy Code: 251K00000X
Type: Agencies
License No.: D50213
License State: MD

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.

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

Authorized Official

The authorized official is the designated individual with the legal authority to make changes to the provider’s official NPI record. For organizations, the authorized official must be a general partner, chairman of the board, CEO, CFO or a direct owner holding at least a 5 percent stake in the medical organization.

Authorized Official Name: DR. LAURENCE B POLSKY M.D., M.P.H.
Authorized Official Title: HEALTH OFFICER
Authorized Official Phone: (410) 535-5400

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
420865000	MEDICAID (05)	MD

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: 21D0687437
Facility Type: Other
Certificate Effective Date: August 09, 2025
Certificate Expiration Date: August 08, 2027
Laboratory Director: LAURENCE B. POLSKY MD
Certificate Type: Certificate for Provider-Performed Microscopy Procedures (PPMP)
Certificate Type Description: This CLIA certificate is issued to Calvert County Health Department in which a physician, midlevel practitioner or dentist that performs specific microscopy procedures during the course of a patient's visit. A limited list of provider-performed microscopy procedures is included under this certificate type, which are categorized as moderate complexity testing.

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 1861761868, we treat the final digit (8) 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 62. The final step is to find the difference between that total and the next multiple of ten (70 - 62 = 8).

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 → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 2

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 6 → 12 → 3 7 → 14 → 5 1 → 2 6 → 12 → 3

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 + 4 + 6 + 2 + 8 + 1 + 2 + 24 = 62

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

The next multiple of ten after 62 is 70. The difference is the calculated check digit.

70 - 62 = 8

This NPI is valid

The calculated check digit is 8, which matches the last digit of 1861761868.