Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

NATHANIEL MALLARD
NPI 1164309969
Social Worker - Clinical in Philadelphia, PA

Active since August 21, 2025
4601 MARKET ST, PHILADELPHIA, PA 19139(215) 220-2127 Get Directions Write a Review

NPPES record last updated: August 3, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Nathaniel Mallard NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

NATHANIEL MALLARD (NPI 1164309969) is an individual clinical provider in Philadelphia, Pennsylvania, licensed in Pennsylvania (CW027546) and active in the NPI registry since August 2025.

NPPES Registry Identity

NPI1164309969
Entity TypeIndividualMale
Primary Taxonomy1041C0700X
Provider Legal NameNATHANIEL MALLARD
Location Address4601 MARKET STPhiladelphia, PA 19139-4636
Mailing Address4601 Market StPhiladelphia, PA 19139-4636 · (215) 220-2127
Sole ProprietorYes
Enumeration DateAugust 21, 2025
Last NPPES UpdateAugust 3, 2026
NPPES CertifiedAugust 3, 2026
NPI 1164309969 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License Licensed in PA · CW027546
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
Also ListedSocial WorkerTaxonomy 104100000X · License SW142961 (PA)
4601 MARKET ST, Philadelphia, PA 19139

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Counselor (Professional)
4601 MARKET ST
PHILADELPHIA, PA 19139
Behavior Analyst
4601 MARKET ST
PHILADELPHIA, PA 19139
Social Worker (Clinical)
4601 MARKET ST
PHILADELPHIA, PA 19139
Registered Nurse
4601 MARKET ST
PHILADELPHIA, PA 19139
Behavior Analyst
4601 MARKET ST
PHILADELPHIA, PA 19139
Psychologist (Clinical Child & Adolescent)
4601 MARKET ST
PHILADELPHIA, PA 19139
Registered Nurse
4601 MARKET ST
PHILADELPHIA, PA 19139
Registered Nurse
4601 MARKET ST
PHILADELPHIA, PA 19139

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Nathaniel Mallard's NPI number?

The NPI number for Nathaniel Mallard is 1164309969. It was assigned to this individual provider in the NPPES registry on August 21, 2025.

Where is Nathaniel Mallard located?

Nathaniel Mallard practices at 4601 Market St, Philadelphia, PA 19139. The listed phone number is (215) 220-2127.

What is Nathaniel Mallard's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

When was this NPI record last updated?

The NPPES record for Nathaniel Mallard was last updated on August 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.