Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Jonathan Carl Siehl, M.S.W., L.I.S.W.

Mental Health Counselor in Worthington, OH · enumerated 2007 · practices at Theresa M.Hom Do LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1427191642

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Jonathan Carl Siehl

Credential M.S.W., L.I.S.W.

Sex Male

Practice address Worthington, OH, 43085

Phone (614) 668-3344

Fax (614) 505-6876

Enumeration date Feb 15, 2007

Last updated in NPPES Nov 8, 2013

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

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License I-1298 (OH) Primary

Other identifiers

Identifier	Type	State	Issuer
1-9H-7857	Other	OH	HORIZON HEALTH
0004599472	Other	OH	AETNA
062957000	Other	OH	MAGELLAN
SISW11843	Other	-	MEDICARE ID - TYPE UNSPECIFIED

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 → Validate an NPI →

Frequently asked questions

What is the NPI number for Jonathan Siehl?

The National Provider Identifier (NPI) for Jonathan Siehl is 1427191642, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jonathan Siehl practice?

The practice location on file with NPPES is in Worthington, OH. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Theresa M.Hom Do LLC Family Medicine Physician · Worthington, OH NPI 1194892133 Anthony Lordo General Practice Dentistry · Worthington, OH NPI 1609939867 Afet Kilinc Mental Health Counselor · Worthington, OH NPI 1770708778 Matthew Fleming Professional Counselor · Worthington, OH NPI 1417263369 Paul Granello Professional Counselor · Worthington, OH NPI 1093022295 Laura Lewis Mental Health Counselor · Worthington, OH NPI 1568712420

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-11-08.