OrganizationActive
Mark C. Littlejohn, MD PLLC
NPI 1588020283 · Otolaryngology Physician · Frisco, TX
Mark C. Littlejohn, MD PLLC is a Otolaryngology Physician organization in Frisco, TX (NPI 1588020283).
Provider details
- NPI number
- 1588020283
- Entity type
- Organization
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mark Littlejohn, Owner(972) 596-4005
- License
- H5784 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Established profile(72/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
8380 Warren Pkwy
Suite 504
Frisco, TX 75034-4198
Phone: (972) 596-4005
Fax: (972) 985-1253
Street-level locationGet directions
Mailing address
8380 Warren Pkwy
Frisco, TX 75034-4198
Registry dates
- Enumerated
- 2016-01-11
- Last updated
- 2016-01-11
Frequently asked questions
- What is Mark C. Littlejohn, MD PLLC's NPI number?
- Mark C. Littlejohn, MD PLLC's National Provider Identifier (NPI) is 1588020283, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark C. Littlejohn, MD PLLC?
- Mark C. Littlejohn, MD PLLC is classified in the NPPES registry as Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark C. Littlejohn, MD PLLC located?
- Mark C. Littlejohn, MD PLLC's practice location on file with NPPES is 8380 Warren Pkwy, Frisco, TX 75034-4198.
- What is Mark C. Littlejohn, MD PLLC's phone number?
- The practice phone number listed in the NPPES registry for Mark C. Littlejohn, MD PLLC is (972) 596-4005.
- Who is the authorized official for Mark C. Littlejohn, MD PLLC?
- The authorized official listed on Mark C. Littlejohn, MD PLLC's NPPES record is Mark Littlejohn, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark C. Littlejohn, MD PLLC's NPI active?
- Yes — Mark C. Littlejohn, MD PLLC's NPI (1588020283) is active in the NPPES registry as of the last update on 2016-01-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.