Matthew Guest, M.D
NPI 1023038601 · Internal Medicine Physician · Escondido, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Guest, M.D is a Internal Medicine Physician provider in Escondido, CA (NPI 1023038601).
Provider details
- NPI number
- 1023038601
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- No
- License
- A91381 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
17 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 17 | $137 |
Typical Medicare-allowed amounts for these services range $137–$137 (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 · 127 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 732 | 268 |
| Amlodipine Besylate | 382 | 139 |
| Losartan Potassium | 360 | 130 |
| Levothyroxine Sodium | 315 | 110 |
| Omeprazole | 307 | 121 |
| Metformin Hclbrand: Metformin Hcl Er | 288 | 108 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-19
- Last updated
- 2021-11-29
Frequently asked questions
- What is Matthew Guest's NPI number?
- Matthew Guest's National Provider Identifier (NPI) is 1023038601, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Guest's specialty?
- Matthew Guest is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Guest located?
- Matthew Guest's practice location on file with NPPES is 460 N Elm St, Escondido, CA 92025-3002.
- What is Matthew Guest's phone number?
- The practice phone number listed in the NPPES registry for Matthew Guest is (760) 737-2000.
- Does Matthew Guest accept Medicare?
- Matthew Guest is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Guest's NPI active?
- Yes — Matthew Guest's NPI (1023038601) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.