Psychologist | Clinical Psychology

Dr. Stephen Leff, PH.D.

3440 Market St, Suite 200, Philadelphia, Pennsylvania, 19104-3325

About Dr. Stephen Leff

Dr. Stephen Leff is a psychologist based in Philadelphia, Pennsylvania who is specialized in Clinical Psychology. Active license number of Dr. Stephen Leff is PS008578L for Clinical Psychology in Pennsylvania. His current practice location is 3440 Market St, Suite 200, Philadelphia. Patients can contact him at 215-590-7555 or can fax him at 215-590-7387. Dr. Stephen Leff, PH.D., specializes in Clinical Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1124110291.

Dr. Stephen Leff is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Dr. Stephen Leff's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. Stephen Leff
Specialization Clinical Psychology
Credentials PH.D.
Gender Male
Practice Address: 3440 Market St, Suite 200
Philadelphia, PA - 19104-3325
Fax 215-590-7387

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1124110291
NPI Enumeration Date: 28 Sep, 2006
NPI Last Update On: 04 Sep, 2012

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. Stephen Leff are as mentioned below.

License NumberSpecializationStateStatus
PS008578LClinical Psychology PennsylvaniaPrimary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. Stephen Leff
3440 Market St, Suite 410
Philadelphia, PA - 19104-3325
Phone: 215-590-7532
Fax: 215-590-4251

Book an Appointment with Dr. Stephen Leff

To schedule an appointment, contact Dr. Stephen Leff at 3440 Market St, Suite 200, Philadelphia, Pennsylvania or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about Dr. Stephen Leff:

Dr. Stephen Leff is a psychologist specializing in Clinical Psychology. He is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Yes, Dr. Stephen Leff is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. Stephen Leff practices at 3440 Market St, Suite 200, Philadelphia, Pennsylvania, 19104-3325.

To schedule an appointment with Dr. Stephen Leff, please contact the office at 215-590-7555.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.