Nathan Lewis, MD
NPI 1912923004 · Internal Medicine Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathan Lewis, MD is a Internal Medicine Physician provider in Pasadena, CA (NPI 1912923004).
Provider details
- NPI number
- 1912923004
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G40994 (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
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
542 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 | 293 | $138 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 155 | $79 |
| Initial Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 35 Minutes99305 | 49 | $140 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 31 | $179 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 14 | $195 |
Typical Medicare-allowed amounts for these services range $79–$195 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 112 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 416 | 129 |
| Amlodipine Besylate | 276 | 78 |
| Furosemide | 189 | 40 |
| Metformin Hcl | 164 | 43 |
| Carvedilol | 151 | 42 |
| Levothyroxine Sodium | 149 | 41 |
| Gabapentin | 136 | 43 |
Practice location
Mailing address
Additional practice locations (1)
- 48 N El Molino AveSuite 201Pasadena, CA 91101-1861Phone: (626) 796-8181Fax: (626) 796-1874
Registry dates
- Enumerated
- 2006-07-14
- Last updated
- 2018-10-23
Frequently asked questions
- What is Nathan Lewis's NPI number?
- Nathan Lewis's National Provider Identifier (NPI) is 1912923004, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathan Lewis's specialty?
- Nathan Lewis is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nathan Lewis located?
- Nathan Lewis's practice location on file with NPPES is 675 S Arroyo Pkwy Ste 310, Pasadena, CA 91105.
- What is Nathan Lewis's phone number?
- The practice phone number listed in the NPPES registry for Nathan Lewis is (626) 796-8181.
- Does Nathan Lewis accept Medicare?
- Nathan Lewis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathan Lewis's NPI active?
- Yes — Nathan Lewis's NPI (1912923004) is active in the NPPES registry as of the last update on 2018-10-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.