Ruth Larson, M.D.
NPI 1538167911 · Specialist · Poway, CA
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ruth Larson, M.D. is a Specialist provider in Poway, CA (NPI 1538167911).
Provider details
- NPI number
- 1538167911
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- G41388 (CA)
Specialties & taxonomies
Other Service Providers
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,194 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) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 353 | $8 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 163 | $97 |
| Removal and Microscopic Exam of Growth of Head, Neck, Hands, Feet, Or Genitals, 1-5 Tissue Blocks17311 | 124 | $665 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 120 | $58 |
| Biopsy of Related Skin Growth, First Growth11102 | 106 | $108 |
| Removal and Microscopic Exam of Growth of Head, Neck, Hands, Feet, Or Genitals, Each Additional Stage, 1-5 Tissue Blocks |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mupirocin | 56 | 49 |
| Doxycycline Hyclate | 30 | 24 |
| Cephalexin | 29 | 26 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 15 | 15 |
| Triamcinolone Acetonide | 12 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-07-11
- Last updated
- 2020-11-19
- Certified
- 2020-11-19
Frequently asked questions
- What is Ruth Larson's NPI number?
- Ruth Larson's National Provider Identifier (NPI) is 1538167911, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ruth Larson's specialty?
- Ruth Larson is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Ruth Larson located?
- Ruth Larson's practice location on file with NPPES is 15525 Pomerado Rd, Poway, CA 92064-2435.
- What is Ruth Larson's phone number?
- The practice phone number listed in the NPPES registry for Ruth Larson is (858) 451-3311.
- Does Ruth Larson accept Medicare?
- Ruth Larson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ruth Larson's NPI active?
- Yes — Ruth Larson's NPI (1538167911) is active in the NPPES registry as of the last update on 2020-11-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.