Charles Oh, M.D.
NPI 1780689042 · Specialist · Tustin, CA
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Oh, M.D. is a Specialist provider in Tustin, CA (NPI 1780689042).
Provider details
- NPI number
- 1780689042
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A83003 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 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
3,117 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) |
|---|---|---|
| Test for Allergy Using Allergenic Extract95004 | 528 | $4 |
| Removal of Impacted Ear Wax69210 | 499 | $49 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 497 | $98 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 274 | $138 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 180 | $178 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone Propionate | 434 | 218 |
| Ipratropium Bromide | 380 | 152 |
| Cefuroxime Axetilbrand: Cefuroxime | 222 | 161 |
| Nortriptyline Hcl | 115 | 48 |
| Azelastine Hcl | 96 | 48 |
| Neomycin/Polymyxin B/Hydrocortbrand: Neomycin-Polymyxin-Hc | 80 | 63 |
| Mupirocin | 75 | 69 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$431 across 24 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
- 2005-06-14
- Last updated
- 2011-06-28
Frequently asked questions
- What is Charles Oh's NPI number?
- Charles Oh's National Provider Identifier (NPI) is 1780689042, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Oh's specialty?
- Charles Oh is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Charles Oh located?
- Charles Oh's practice location on file with NPPES is 2552 Walnut Ave, Tustin, CA 92780-6935.
- What is Charles Oh's phone number?
- The practice phone number listed in the NPPES registry for Charles Oh is (714) 508-1600.
- Does Charles Oh accept Medicare?
- Charles Oh is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Oh's NPI active?
- Yes — Charles Oh's NPI (1780689042) is active in the NPPES registry as of the last update on 2011-06-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.