Charles Holzner, M.D.
NPI 1861439465 · Endocrinology, Diabetes & Metabolism Physician · Downey, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Holzner, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Downey, CA (NPI 1861439465).
Provider details
- NPI number
- 1861439465
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G45314 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
49 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 37 | $97 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 12 | $139 |
Typical Medicare-allowed amounts for these services range $97–$139 (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 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Furosemide | 37 | 22 |
| Ciprofloxacin Hcl | 28 | 26 |
| Azithromycin | 27 | 18 |
| Prednisone | 24 | 19 |
| Semaglutidebrand: Ozempic | 22 | — |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 17 | — |
| Lorazepam | 17 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$120 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-01
- Last updated
- 2015-03-19
Frequently asked questions
- What is Charles Holzner's NPI number?
- Charles Holzner's National Provider Identifier (NPI) is 1861439465, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Holzner's specialty?
- Charles Holzner is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Holzner located?
- Charles Holzner's practice location on file with NPPES is 10000 Lakewood Blvd, Downey, CA 90240-4020.
- What is Charles Holzner's phone number?
- The practice phone number listed in the NPPES registry for Charles Holzner is (562) 862-2384.
- Does Charles Holzner accept Medicare?
- Charles Holzner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Holzner's NPI active?
- Yes — Charles Holzner's NPI (1861439465) is active in the NPPES registry as of the last update on 2015-03-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.