Catherine Koper, MD
NPI 1245466929 · Internal Medicine Physician · Newport Beach, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catherine Koper, MD is a Internal Medicine Physician provider in Newport Beach, CA (NPI 1245466929).
Provider details
- NPI number
- 1245466929
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A13199 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 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
1,952 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 1,035 | $116 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 659 | $93 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 164 | $170 |
| Critical Care, First 30-74 Minutes99291 | 56 | $206 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 38 | $114 |
Typical Medicare-allowed amounts for these services range $93–$206 (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 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Meropenem | 164 | 12 |
| Ertapenem Sodiumbrand: Ertapenem | 148 | 46 |
| Vancomycin Hcl | 99 | 33 |
| Doxycycline Hyclate | 98 | 41 |
| Daptomycin | 90 | 24 |
| Cefepime Hcl | 80 | 21 |
| Fluconazole | 69 | 21 |
| Cefazolin Sodium | 55 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$181 across 8 records (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
- 2009-06-08
- Last updated
- 2015-09-29
Frequently asked questions
- What is Catherine Koper's NPI number?
- Catherine Koper's National Provider Identifier (NPI) is 1245466929, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catherine Koper's specialty?
- Catherine Koper is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Catherine Koper located?
- Catherine Koper's practice location on file with NPPES is 320 Superior Ave, Newport Beach, CA 92663-2716.
- What is Catherine Koper's phone number?
- The practice phone number listed in the NPPES registry for Catherine Koper is (949) 515-3590.
- Does Catherine Koper accept Medicare?
- Catherine Koper is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catherine Koper's NPI active?
- Yes — Catherine Koper's NPI (1245466929) is active in the NPPES registry as of the last update on 2015-09-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.