TERRY W SIDNEY
NPI 1821987629
Counselor - Mental Health in Forestville, MD

NPI Status: Active since June 30, 2025

Contact Information

3900 FORESTVILLE RD
FORESTVILLE, MD
ZIP 20747
Phone: (202) 210-2478

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Newly Listed Provider
This NPI profile has been added to the NPI registry within the last 30 days.

Table of Contents

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

Individual
Male
Counselor
Mental Health

About TERRY SIDNEY

This page provides the complete NPI Profile along with additional information for Terry Sidney, a provider established in Forestville, Maryland with a medical specialization in Counselor, focusing in mental health . The healthcare provider is registered in the NPI registry with number 1821987629 assigned on June 2025. The practitioner's primary taxonomy code is 101YM0800X with license number INTERN (MD). The provider is registered as an individual and his NPI record was last updated June 2025.

NPI: 1821987629
Provider Name: TERRY W SIDNEY
Gender: Male
Entity Type: Individual
Location Address: 3900 FORESTVILLE RD FORESTVILLE, MD 20747
Location Phone: (202) 210-2478
Mailing Address: 3900 FORESTVILLE RD FORESTVILLE, MD 20747
Is Sole Proprietor?: No
Enumeration Date: 06-30-2025
Last Update Date: 06-30-2025
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A mental health counselor like Terry Sidney provides treatment to individuals, families, couples, and groups for mental and emotional health issues and relationship problems. Mental health counselors treat clients with a variety of conditions, including anxiety, depression, grief, low self-esteem, stress, and suicidal impulses.

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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: Counselor Mental Health
Taxonomy Code: 101YM0800X
Type: Behavioral Health & Social Service Providers
License No.: INTERN
License State: MD

NPI Validation Check Digit Calculation

The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.

Start with the original NPI number, the last digit is the check digit and is not used in the calculation.
1	8	2	1	9	8	7	6	2	9
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
2	8	4	1	18	8	14	6	4
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 8 + 4 + 1 + 1 + 8 + 8 + 1 + 4 + 6 + 4 + 24 = 71
Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit.
80 - 71 = 9									9

The NPI number 1821987629 is valid because the calculated check digit 9 using the Luhn validation algorithm matches the last digit of the original NPI number.