Clayton Naddell, MD
NPI 1699126904 · Internal Medicine Physician · Mission Hills, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clayton Naddell, MD is a Internal Medicine Physician provider in Mission Hills, CA (NPI 1699126904).
Provider details
- NPI number
- 1699126904
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A156330 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
207 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 84 | $98 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 35 | $62 |
| Administration of Influenza Virus VaccineG0008 | 21 | $35 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 21 | $140 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 17 | $138 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 15 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 154 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 975 | 309 |
| Metformin Hcl | 584 | 184 |
| Amlodipine Besylate | 527 | 162 |
| Lisinopril | 433 | 134 |
| Losartan Potassium | 420 | 126 |
| Rosuvastatin Calcium | 382 | 140 |
| Levothyroxine Sodium |
Practice location
Mailing address
Additional practice locations (1)
- 1120 W Washington BlvdLos Angeles, CA 90015-3316Phone: (213) 623-2225
Registry dates
- Enumerated
- 2016-06-28
- Last updated
- 2026-03-09
- Certified
- 2026-03-09
Frequently asked questions
- What is Clayton Naddell's NPI number?
- Clayton Naddell's National Provider Identifier (NPI) is 1699126904, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clayton Naddell's specialty?
- Clayton Naddell is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Clayton Naddell located?
- Clayton Naddell's practice location on file with NPPES is 11600 Indian Hills Rd Ste 102, Mission Hills, CA 91345-1225.
- What is Clayton Naddell's phone number?
- The practice phone number listed in the NPPES registry for Clayton Naddell is (818) 838-4500.
- Does Clayton Naddell accept Medicare?
- Clayton Naddell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clayton Naddell's NPI active?
- Yes — Clayton Naddell's NPI (1699126904) is active in the NPPES registry as of the last update on 2026-03-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.