Megan Littlefield, M.D.
NPI 1013964287 · Internal Medicine Physician · Billings, MT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Megan Littlefield, M.D. is a Internal Medicine Physician provider in Billings, MT (NPI 1013964287).
Provider details
- NPI number
- 1013964287
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 225423 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
76 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) |
|---|---|---|
| Hemoglobin A1c Level83036 | 23 | $7 |
| Administration of Influenza Virus VaccineG0008 | 22 | $21 |
| Admn Sarscov2 Vacc 1 Dose90480 | 19 | $21 |
| Urine Microalbumin (protein) Level82043 | 12 | $5 |
Typical Medicare-allowed amounts for these services range $5–$21 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Varicella-Zoster Ge/As01b/Pfbrand: Shingrix | 79 | 64 |
| Typhoid Vi Polysacch Vaccinebrand: Typhim Vi | 77 | 77 |
| Rsvpref3 Antigen/As01e/Pfbrand: Arexvy | 65 | 65 |
| Hepatitis a and B Vaccine/Pfbrand: Twinrix | 58 | 35 |
| Atorvastatin Calcium | 55 | 12 |
| Diphth,pertuss(acell),tet Vacbrand: Boostrix Tdap | 54 | 54 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-31
- Last updated
- 2015-05-08
Frequently asked questions
- What is Megan Littlefield's NPI number?
- Megan Littlefield's National Provider Identifier (NPI) is 1013964287, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Megan Littlefield's specialty?
- Megan Littlefield is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Megan Littlefield located?
- Megan Littlefield's practice location on file with NPPES is 123 S 27th St, Billings, MT 59101-4227.
- What is Megan Littlefield's phone number?
- The practice phone number listed in the NPPES registry for Megan Littlefield is (406) 247-3350.
- Does Megan Littlefield accept Medicare?
- Megan Littlefield is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Megan Littlefield's NPI active?
- Yes — Megan Littlefield's NPI (1013964287) is active in the NPPES registry as of the last update on 2015-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.