1. Home
  2. Directory
  3. California
  4. Lajolla
  5. Orthopaedic Surgery
  6. NPI Profile

MARK C. NELSON, MD, INC
NPI 1811033590
Orthopaedic Surgery - Orthopaedic Surgery of the Spine in Lajolla, CA

Active since January 29, 2007
9834 GENESEE AVENUE, SUITE 223, LAJOLLA, CA 92037(858) 777-7917(858) 703-5048 Get Directions Write a Review

NPPES record last updated: February 2, 2015. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Mark C. Nelson, Md, Inc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK C. NELSON, MD, INC (NPI 1811033590) is a healthcare organization registered as an orthopaedic surgery of the spine in Lajolla, California and active in the NPI registry since January 2007. The organization lists Mark C Nelson, President, as its authorized official.

NPPES Registry Identity

NPI1811033590
Entity TypeOrganization
Primary Taxonomy207XS0117X
Legal Business NameMARK C. NELSON, MD, INC
Location Address9834 GENESEE AVENUE, SUITE 223Lajolla, CA 92037
Mailing Address9834 Genesee Avenue, Suite 223Lajolla, CA 92037 · (858) 777-7917 · Fax (858) 703-5048
Phone(858) 777-7917
Fax(858) 703-5048
Organization SubpartNo
Authorized OfficialMark C NelsonPresident · (858) 571-0606
Enumeration DateJanuary 29, 2007
Last NPPES UpdateFebruary 2, 2015
✔ NPI 1811033590 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOrthopaedic Surgery · Orthopaedic Surgery of the SpineAllopathic & Osteopathic Physicians
Taxonomy Code207XS0117X
License✔ Licensed in CA · A80416
Definition
Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, orthopaedic surgeons of the spine deal with the evaluation and nonoperative and operative treatment of the full spectrum of primary spinal disorders including trauma, degenerative, deformity, tumor, and reconstructive.
9834 GENESEE AVENUE, Lajolla, CA 92037
Open in Google Maps ↗

Other Identifiers 4

OtherW17893CA · Medicare Ptan
OtherWA80416BCA · Medicare Provider Id
Medicare UPINH75303CA
OtherW17893CA · Medicare Group Number

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark C. Nelson, Md, Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Mark C. Nelson, MD, Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Mark Nelson, MD
Orthopedic Surgery
NPI 1245341601
9834 GENESEE AVENUE SUITE 223
Lajolla, CA 92037
(858) 777-7917
✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark C. Nelson, MD, Inc's NPI number?

The NPI number for Mark C. Nelson, MD, Inc is 1811033590. It was assigned to this organization in the NPPES registry on January 29, 2007.

Where is Mark C. Nelson, MD, Inc located?

Mark C. Nelson, MD, Inc is located at 9834 Genesee Avenue Suite 223, Lajolla, CA 92037. The listed phone number is (858) 777-7917.

What is Mark C. Nelson, MD, Inc's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Orthopaedic Surgery of the Spine, with taxonomy code 207XS0117X.

Is Mark C. Nelson, MD, Inc enrolled in Medicare?

Yes. Mark C. Nelson, MD, Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Mark C. Nelson, MD, Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Orthopedic Surgery) reassigns their Medicare billing to Mark C. Nelson, MD, Inc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Mark C. Nelson, MD, Inc was last updated on February 2, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.