Matthew Littlefield, M.D.
NPI 1861640146 · Psychiatry Physician · Pittsburg, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Littlefield, M.D. is a Psychiatry Physician provider in Pittsburg, CA (NPI 1861640146).
Provider details
- NPI number
- 1861640146
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A114067 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 40 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lorazepam | 212 | 31 |
| Trazodone Hcl | 187 | 59 |
| Escitalopram Oxalate | 144 | 45 |
| Bupropion Hclbrand: Bupropion Xl | 143 | 40 |
| Bupropion Hclbrand: Bupropion Hcl Sr | 102 | 33 |
| Clonazepam | 97 | 19 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-08-29
- Last updated
- 2022-02-11
Frequently asked questions
- What is Matthew Littlefield's NPI number?
- Matthew Littlefield's National Provider Identifier (NPI) is 1861640146, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Littlefield's specialty?
- Matthew Littlefield is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Littlefield located?
- Matthew Littlefield's practice location on file with NPPES is 2311 Loveridge Rd, Pittsburg, CA 94565-5117.
- What is Matthew Littlefield's phone number?
- The practice phone number listed in the NPPES registry for Matthew Littlefield is (925) 431-2600.
- Does Matthew Littlefield accept Medicare?
- Matthew Littlefield is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Littlefield's NPI active?
- Yes — Matthew Littlefield's NPI (1861640146) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.