Dr. John Joseph Mcclanahan, PHD,CCDC,LCADC

Dr. John Joseph Mcclanahan is a Addiction (Substance Use Disorder) Counselor provider (Counselor) practicing in Arnold, MD, registered in the NPPES registry with NPI 1720139934 since 2007. The credential PHD stands for Doctor of Philosophy.

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1720139934
Entity type	Individual (Type 1)
Name	Dr. John Joseph Mcclanahan
Credential	PHD,CCDC,LCADC
Sex	Male
Practice address	Arnold, MD, 21012
Phone	4106267550
Fax	4106268805
Enumeration date	2007-01-15
Last updated in NPPES	2007-07-08

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
101YA0400X	Addiction (Substance Use Disorder) Counselor	Primary	LCA040	MD

PHD — Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Copy-ready billing details

Provider: John Mcclanahan, PHD,CCDC,LCADC
NPI: 1720139934
Taxonomy: 101YA0400X (Addiction (Substance Use Disorder) Counselor)
Address: Arnold, MD, 21012

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1326092545	Joanne Hasman	Individual	Advanced Practice Midwife	Arnold, MD
1922011675	Special Beginnings Birth & Women'S Center, LLC	Organization	Birthing Clinic/Center	Arnold, MD
1710061155	Donna Greenfield	Individual	Nurse Practitioner	Arnold, MD
1679635098	Special Beginnings Birth & Women'S Center, LLC	Organization	Advanced Practice Midwife	Arnold, MD
1144451337	Special Beginnings Facility, LLC	Organization	Birthing Clinic/Center	Arnold, MD
1407181431	Kathleen Mcclelland	Individual	Advanced Practice Midwife	Arnold, MD
1497075741	Laurel Naff	Individual	Lactation Consultant (Registered Nurse)	Arnold, MD
1992007272	Kathy Mercer	Individual	Advanced Practice Midwife	Arnold, MD

Verify this record

Cross-check NPI 1720139934 against the authoritative CMS record: view Dr. John Joseph Mcclanahan on the official NPPES registry .

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.

Frequently asked questions

How do I verify John Mcclanahan's NPI record?

Cross-check NPI 1720139934 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1720139934 active?

Yes — as of the latest NPPES snapshot, NPI 1720139934 is active (record last updated 2007-07-08).

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.