Mary Littlehorn, FNP
NPI 1952645558 · Family Nurse Practitioner · Tucson, AZ
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Littlehorn, FNP is a Family Nurse Practitioner provider in Tucson, AZ (NPI 1952645558).
Provider details
- NPI number
- 1952645558
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Female
- Sole proprietor
- No
- License
- RN133474 (AZ)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
3,470 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 1,231 | $5 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 757 | $75 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 474 | $42 |
| Destruction of Skin Growth, 1-14 Growths17110 | 329 | $93 |
| Biopsy of Related Skin Growth, First Growth11102 | 211 | $72 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ketoconazole | 150 | 78 |
| Clobetasol Propionate | 103 | 68 |
| Triamcinolone Acetonide | 101 | 84 |
| Doxycycline Hyclate | 67 | 42 |
| Metronidazole | 56 | 46 |
| Fluconazole | 44 | 40 |
| Mupirocin | 43 | 32 |
| Ciclopirox | 36 | 23 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,137 across 46 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 5304 E. Grant Rd.Tucson, AZ 85712Phone: (520) 324-5070
Registry dates
- Enumerated
- 2012-11-20
- Last updated
- 2021-07-06
- Certified
- 2021-07-06
Frequently asked questions
- What is Mary Littlehorn's NPI number?
- Mary Littlehorn's National Provider Identifier (NPI) is 1952645558, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Littlehorn's specialty?
- Mary Littlehorn is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary Littlehorn located?
- Mary Littlehorn's practice location on file with NPPES is 2732 N Alvernon Way, Tucson, AZ 85712-1804.
- What is Mary Littlehorn's phone number?
- The practice phone number listed in the NPPES registry for Mary Littlehorn is (520) 382-3330.
- Does Mary Littlehorn accept Medicare?
- Mary Littlehorn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Littlehorn's NPI active?
- Yes — Mary Littlehorn's NPI (1952645558) is active in the NPPES registry as of the last update on 2021-07-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.