Doctor profile · Federal record
Dr. Charles Feng, MD
Allergy & Immunology Physician (CMS: Allergy/Immunology) · Internal Medicine Physician · Mountain View, CA
- NPI 1518260306
- Accepts Medicare
- 17 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
701 E El Camino Real
Mountain View, CA 940402833
(650) 934-7888 - Mailing address
-
2350 W. El Camino Real, 2Nd Floor
Mountain View, CA 940406203
Credentials & registration
- NPI registered
- December 2010 — 16 yrs on file
- Profile last updated
- September 23, 2015
- Year of graduation
- 2009 — 17 yrs since
- Specialty taxonomy
- 207K00000X — NUCC code
- State license (1)
- California #A115080
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1518260306. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,828
Distinct HCPCS
8
Medicare allowed
$37,811
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
95004 |
Test for allergy using allergenic extract | 1,119 | 26 | $5 | |
95165 |
Professional service for preparation and provision of 1 or more antigens | 320 | 17 | $21 | |
95117 |
Professional service for multiple injections of allergen | 172 | 42 | $16 | |
95115 |
Professional service for single injection of allergen | 85 | 19 | $14 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 72 | 49 | $151 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 20 | 20 | $201 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 20 | 20 | $107 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 20 | 16 | $218 |
In context: peer comparison
Among 3 peers in Mountain View Allergy & Immunology Physician, average services per provider: 209. This provider delivers 8.7× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
237
Patients
26
Total drug cost
$166,542
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Azelastine Hcl | Generic | 38 | 15 | $2,145 |
| Ipratropium Bromide | Generic | 29 | 0 | $1,153 |
| Fluticasone Propionate | Generic | 21 | 0 | $799 |
| Dupixent Pen (Dupilumab) | Brand | 19 | 0 | $70,266 |
| Montelukast Sodium | Generic | 19 | 0 | $198 |
| Spiriva Respimat (Tiotropium Bromide) | Brand | 18 | 0 | $11,404 |
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 16 | 0 | $463 |
| Epinephrine | Generic | 15 | 11 | $2,896 |
| Dupixent Syringe (Dupilumab) | Brand | 14 | 0 | $54,790 |
| Dulera (Mometasone/Formoterol) | Brand | 13 | 0 | $4,871 |
Frequently asked questions
What is Dr. Charles Feng's medical specialty?
Dr. Charles Feng practices Allergy & Immunology Physician in Mountain View, CA.
Where does Dr. Charles Feng practice?
Dr. Charles Feng practices at 701 E El Camino Real, Mountain View, CA 940402833. Office phone: 6509347888.
What is Dr. Charles Feng's NPI?
Dr. Charles Feng's National Provider Identifier (NPI) is 1518260306, issued by NPPES.
Does Dr. Charles Feng accept Medicare assignment?
Yes. Dr. Charles Feng accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Charles Feng commonly perform?
Top Medicare-reported procedures in 2023: Test for allergy using allergenic extract (HCPCS 95004); Professional service for preparation and provision of 1 or more antigens (HCPCS 95165); Professional service for multiple injections of allergen (HCPCS 95117). Source: CMS Medicare Physician & Other Practitioners file.