Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Mark Clifton Ottoson, N.P.

Family Nurse Practitioner in Saint Helena, CA · enumerated 2011 · practices at Norman Wall Do Inc..

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

National Provider Identifier

1083905103

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Registry record

Entity type Individual (Type 1)

Name Mr. Mark Clifton Ottoson

Credential N.P.

Sex Male

Practice address 1370 Railroad Ave, Saint Helena, CA, 94574

Phone (707) 963-4399

Fax (707) 963-4796

Enumeration date Apr 23, 2011

Last updated in NPPES Apr 23, 2011

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 429620 (CA) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP credential

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

Is NPI 1083905103 active?

Yes, as of the latest NPPES snapshot, NPI 1083905103 is active (record last updated 2011-04-23).

How do I verify Mark Ottoson's NPI record?

Cross-check NPI 1083905103 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Norman Wall Do Inc. Primary Care Clinic/Center · Saint Helena, CA NPI 1467687236

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-04-23.