MARCUS E. JOHN LCSW-C
NPI 1770306557
Social Worker - School in Gaithersburg, MD
NPI Status: Active since November 01, 2024
Contact Information
640 E DIAMOND AVE
GAITHERSBURG, MD
ZIP 20877
Phone: (202) 313-2397
- Individual
- Male
- Social Worker
- School
- PECOS Enrolled
About MARCUS JOHN
This page provides the complete NPI Profile along with additional information for Marcus John, a provider established in Gaithersburg, Maryland with a medical specialization in Social Worker, focusing in school . The healthcare provider is registered in the NPI registry with number 1770306557 assigned on November 2024. The practitioner's primary taxonomy code is 1041S0200X with license number 26518 (MD). The provider is registered as an individual and his NPI record was last updated January 2026.
- NPI
- 1770306557
- Provider Name
- MARCUS E. JOHN LCSW-C
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 640 E DIAMOND AVE GAITHERSBURG, MD 20877
- Location Phone
- (202) 313-2397
- Mailing Address
- 12517 BREWSTER LN BOWIE, MD 20715
- Mailing Phone
- (202) 313-2397
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 11-01-2024
- Last Update Date
- 01-09-2026
- Code Navigator
A school social worker like Marcus John works with teachers, parents, and school administrators to develop plans and strategies to improve students' academic performance and social development. Students are referred to school social workers to deal with problems like aggressive behavior, bullying, or frequent school absences.
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
Social Worker School
- Taxonomy Code
- 1041S0200X
- Type
- Behavioral Health & Social Service Providers
- License No.
- 26518
- License State
- MD
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 1041C0700X | Behavioral Health & Social Service Providers | Social Worker | 26518 (MD) |
Medicare Participation & PECOS Enrollment Status
Marcus John is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): No
Eligible to Order or Refer Power Mobility Devices: No
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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 1770306557, we treat the final digit (7) 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 53. The final step is to find the difference between that total and the next multiple of ten (60 - 53 = 7).
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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 53 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 4 providers are registered at the same or a nearby location.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1770306557, enumerated as an "individual" on November 01, 2024.
The provider is located at 640 E DIAMOND AVE GAITHERSBURG, MD 20877 and the phone number is (202) 313-2397.
Social Worker with taxonomy code 1041S0200X and a focus in School.
