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

Dr. Otto Frederick Tidwell, D.D.S.

Oral and Maxillofacial Surgery (Dentist) in Rehoboth Beach, DE · enumerated 2006 · practices at Southern Delaware Associates of Dental Specialities.

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

National Provider Identifier

1407803398

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Registry record

Entity type Individual (Type 1)

Name Dr. Otto Frederick Tidwell

Credential D.D.S.

Sex Male

Practice address Rehoboth Beach, DE, 19971

Phone (302) 226-1606

Fax (302) 226-1609

Enumeration date May 27, 2006

Last updated in NPPES Jan 14, 2014

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

Taxonomy & licenses

1223S0112X Oral and Maxillofacial Surgery (Dentist) Dental Providers · License DS022622L (PA) Primary

1223S0112X Oral and Maxillofacial Surgery (Dentist) Dental Providers · License 22DIO1475500 (NJ) Secondary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Other identifiers

Identifier	Type	State	Issuer
0060881000	Other	PA	BLUE CROSS PROVIDER NUMBE
121367	Other	PA	UNITED CONCORDIA PROVIDER

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.

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Frequently asked questions

What specialty is Otto Tidwell?

Otto Tidwell is registered in NPPES with the primary taxonomy of Oral and Maxillofacial Surgery (Dentist). The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Southern Delaware Associates of Dental Specialities Oral and Maxillofacial Surgery Clinic/Center · Rehoboth Beach, DE NPI 1952687360

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-01-14.