Quick answers
- Does Dennis P. Lewis accept Medicare assignment?
- Yes. Medicare's clinician data says Dennis P. Lewis accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Dennis P. Lewis see?
- In 2024, CMS data shows 851 Original Medicare patients and 3,982 services for Dennis P. Lewis. This counts Original Medicare only and measures volume, not quality.
- What is Dennis P. Lewis's NPI number?
- 1780608190. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Dennis P. Lewis, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 851 |
|---|---|
| Services billed to Medicare | 3,982 |
| Different services or procedures | 65 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)867 services
- Urinalysis, manual test (81002)459 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)421 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)412 services
- X-ray of chest, 2 views (71046)391 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol70%
- High blood pressure67%
- Arthritis43%
- Diabetes27%
- Ischemic heart disease18%
- Anxiety17%
Hospitals where Dennis P. Lewis works
Medicare's Facility Affiliation Data lists Dennis P. Lewis at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Henry Mayo Newhall HospitalValencia, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050624
Practice locations
Addresses where Dennis P. Lewis is enrolled with Medicare (CMS data updated October 2, 2026).
- 23823 Valencia Blvd, Suite 160Valencia, CA 91355 (661) 254‑0026
Specialties
- Family Practiceprimary
Other family doctors in Valencia
Clinicians with the same Medicare primary specialty in Valencia, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1780608190 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians