Dr. Mary Callsen
About this NPIWhat this record shows.
NPI 1639137573 is registered to Dr. Mary Callsen, a Internal Medicine practising at 7315 Wisconsin Ave in Bethesda, Maryland. Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties. Dr. Mary Callsen has been enumerated in the National Provider Identifier (NPI) registry since 2006.
Your brand here.
Secondary identifiers
Additional identifiers this provider has registered with NPPES. Used by medical billers, credentialers, and insurance verifiers to cross-reference claims and enrollments.
Other
- 1588055MD· Issued by CIGNA PROVIDER NUMBER
- 5770131MD· Issued by AETNA PPO PROVIDER NUMBER
- 61813201MD· Issued by BSMD PROVIDER NUMBER
- 8127031MD· Issued by MDIPA PROVIDER NUMBER
- 9070 0013MD· Issued by BSDC PROVIDER NUMBER
- 8127031MD· Issued by OPTIMUM CHOICE PROVIDER #
- 100797MD· Issued by JHHC PROVIDER NUMBER
- 521186611MD· Issued by UNITED HEALTHCARE PROV #
- 8127031MD· Issued by ALLIANCE PROVIDER NUMBER
- 5770131MD· Issued by AETNA HMO PROVIDER NUMBER
- 8127031MD· Issued by MAMSI PROVIDER NUMBER
Source: NPPES public registry.
Medicare enrollment
This provider holds a Medicare enrollment on file with the Provider Enrollment, Chain and Ownership System (PECOS). Each enrollment carries a public Medicare Enrollment ID (ENRLMT_ID) used by billers and intermediaries.
Practitioner
- I20100525000299Internal MedicineDC
Source: CMS PECOS public enrollment file.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Dr. Mary Callsen accepts. To confirm in-network status with your specific health plan, contact Dr. Mary Callsen directly at (240) 235-9100.
Frequently asked
Yes. NPI 1639137573 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (240) 235-9100.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Dr. Mary Callsen is a Type-1 individual NPI.