Charles Feng, MD
NPI 1518260306 · Allergy & Immunology Physician · Mountain View, CA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Feng, MD is a Allergy & Immunology Physician provider in Mountain View, CA (NPI 1518260306).
Provider details
- NPI number
- 1518260306
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A115080 (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 tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,573 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) |
|---|---|---|
| Test for Allergy Using Allergenic Extract95004 | 937 | $5 |
| Professional Service for Preparation and Provision of 1 Or More Antigens95165 | 340 | $20 |
| Professional Service for Multiple Injections of Allergen95117 | 117 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 74 | $147 |
| Professional Service for Single Injection of Allergen95115 | 57 | $14 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 25 | $108 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azelastine Hcl | 39 | 15 |
| Ipratropium Bromide | 32 | 11 |
| Dupilumabbrand: Dupixent Pen | 27 | — |
| Fluticasone Propionate | 21 | 11 |
| Azelastine/Fluticasonebrand: Azelastine-Fluticasone | 17 | — |
| Flunisolide | 16 | — |
| Epinastine Hcl | 15 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-12-16
- Last updated
- 2015-09-23
Frequently asked questions
- What is Charles Feng's NPI number?
- Charles Feng's National Provider Identifier (NPI) is 1518260306, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Feng's specialty?
- Charles Feng is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Feng located?
- Charles Feng's practice location on file with NPPES is 701 E El Camino Real, Mountain View, CA 94040-2833.
- What is Charles Feng's phone number?
- The practice phone number listed in the NPPES registry for Charles Feng is (650) 934-7888.
- Does Charles Feng accept Medicare?
- Charles Feng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Feng's NPI active?
- Yes — Charles Feng's NPI (1518260306) is active in the NPPES registry as of the last update on 2015-09-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.