Charles H Feng, MD
Allergy/Immunology · Mountain View
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 14
- 2 carriers
- Offices
- 3
Offices
3 locations · Sutter Bay Medical Foundation · 3,783 clinicians in this group
Plans that list them
14 plans · 2 carriers
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Feng’s office to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
14 of 14 plans
| Alignment Health BreathEasy (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Clarity (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Harmony (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes CalPlus (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes Care (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Honor+ Plan (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health My Choice CalCare (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Silicon (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Sutter Advantage +More (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health smartHMO (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health the ONE (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| DualConnect (HMO D-SNP) | Santa Clara Family Health Plan | Listed | Sep 1, 2026 |
California Medical Board record
Licence A115080 · Current
Licensed to practise in California · since 2010 · expires 2028-06-30 · David Geffen School of Medicine at UCLA.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
Original Medicare doctor bills
$105,855
Medicare paid this office $105,855 for 114 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Return visit (30+ min) | 47 | $8,390 | $113 |
| Professional service for preparation and provision of 1 or more antigens | 19 | $5,356 | $16 |
| New patient visit (45+ min) | 23 | $3,668 | $159 |
| Test for allergy using allergenic extract | 22 | $3,350 | $4 |
| Short return visit (20+ min) | 25 | $1,979 | $79 |
See all 7 services
| Return visit (30+ min) | 47 | $8,390 | $113 |
| Professional service for preparation and provision of 1 or more antigens | 19 | $5,356 | $16 |
| New patient visit (45+ min) | 23 | $3,668 | $159 |
| Test for allergy using allergenic extract | 22 | $3,350 | $4 |
| Short return visit (20+ min) | 25 | $1,979 | $79 |
| Professional service for multiple injections of allergen | 42 | $1,448 | $12 |
| Professional service for single injection of allergen | 14 | $548 | $10 |
Who their Medicare patients are
114 Original Medicare patients in 2024. Average age 72 · Women 63% · Health risk score 0.82. At or below the middle of the specialty; the typical allergy/ immunology clinician is at 1.
Conditions among them: High blood pressure 54% · Cancer 14% · Diabetes 13% · Coronary heart disease 11% · COPD 11% · Atrial fibrillation 11% · Depression 10%.
The office billed $381,214, Medicare allowed $133,880 and paid $105,855; for 4,449 services of 23 kinds.
Original Medicare patients only. A risk score of 1.0 is the average Medicare patient; higher means sicker. Any count under 11 is hidden.
Year by year
| 2024 | 114 | 4,449 | 72 | 0.82 | $381,214 | $105,855 |
| 2023 | 133 | 3,621 | 73 | 0.74 | $255,919 | $71,645 |
| 2022 | 161 | 2,663 | 72 | 0.79 | $143,039 | $38,351 |
| 2021 | 132 | 1,277 | 72 | 0.77 | $89,515 | $25,946 |
| 2020 | 127 | 1,302 | 73 | 0.80 | $81,940 | $22,898 |
| 2019 | 156 | 2,620 | 74 | 0.97 | $124,814 | $31,221 |
| 2018 | 166 | 2,718 | 74 | 0.91 | $133,189 | $39,404 |
| 2017 | 75 | 1,678 | 71 | 0.90 | $76,152 | $23,932 |
| 2016 | 71 | 1,333 | 72 | 0.91 | $65,675 | $18,893 |
| 2015 | 18 | 313 | 70 | 0.82 | $14,055 | $3,974 |
Original Medicare only. A service billed for fewer than 11 people in a year is hidden, so the lines can add up to less than the year's total.
See the services billed each year
2023: 8 services
| Return visit (30+ min) | 49 | $7,427 | $103 |
| Professional service for preparation and provision of 1 or more antigens | 17 | $5,155 | $16 |
| Test for allergy using allergenic extract | 26 | $4,664 | $4 |
| New patient visit (45+ min) | 20 | $2,898 | $145 |
| Long return visit (40+ min) | 16 | $2,654 | $133 |
| Professional service for multiple injections of allergen | 42 | $1,847 | $11 |
| Short return visit (20+ min) | 20 | $1,700 | $85 |
| Professional service for single injection of allergen | 19 | $797 | $9 |
2022: 8 services
| Professional service for preparation and provision of 1 or more antigens | 16 | $5,302 | $17 |
| Return visit (30+ min) | 40 | $4,878 | $104 |
| Test for allergy using allergenic extract | 26 | $4,256 | $4 |
| Long return visit (40+ min) | 17 | $3,624 | $173 |
| Professional service for multiple injections of allergen | 57 | $2,462 | $11 |
| New patient visit (30+ min) | 22 | $2,250 | $102 |
| Short return visit | 24 | $1,122 | $47 |
| Professional service for single injection of allergen | 20 | $970 | $9 |
2021: 6 services
| Return visit (30+ min) | 25 | $3,063 | $106 |
| Professional service for multiple injections of allergen | 55 | $2,369 | $11 |
| Test for allergy using allergenic extract | 11 | $1,805 | $4 |
| New patient visit (30+ min) | 15 | $1,653 | $110 |
| Short return visit | 11 | $623 | $57 |
| Professional service for single injection of allergen | 13 | $380 | $8 |
2020: 5 services
| New patient visit (30+ min) | 20 | $2,098 | $105 |
| Short return visit (20+ min) | 19 | $1,551 | $65 |
| Professional service for multiple injections of allergen | 58 | $1,544 | $10 |
| Return visit (30+ min) | 11 | $797 | $72 |
| Professional service for single injection of allergen | 15 | $393 | $9 |
2019: 9 services
| Test for allergy using allergenic extract | 45 | $8,344 | $4 |
| Short return visit (20+ min) | 36 | $3,957 | $68 |
| New patient visit (30+ min) | 37 | $3,802 | $103 |
| New patient visit (45+ min) | 25 | $3,657 | $146 |
| Professional service for multiple injections of allergen | 54 | $1,555 | $10 |
| Return visit (30+ min) | 15 | $1,421 | $95 |
| Short return visit | 13 | $670 | $45 |
| Test to measure expiratory airflow and volume | 12 | $589 | $37 |
| Professional service for single injection of allergen | 17 | $588 | $9 |
2018: 8 services
| Test for allergy using allergenic extract | 40 | $8,851 | $5 |
| New patient visit (45+ min) | 25 | $3,712 | $148 |
| Short return visit (20+ min) | 30 | $3,608 | $69 |
| New patient visit (30+ min) | 33 | $3,252 | $99 |
| Return visit (30+ min) | 18 | $2,239 | $90 |
| Professional service for multiple injections of allergen | 66 | $1,767 | $10 |
| Test to measure expiratory airflow and volume | 20 | $817 | $36 |
| Professional service for single injection of allergen | 19 | $599 | $8 |
2017: 5 services
| Test for allergy using allergenic extract | 29 | $7,691 | $7 |
| New patient visit (45+ min) | 19 | $2,745 | $144 |
| New patient visit (30+ min) | 22 | $2,230 | $101 |
| Short return visit (20+ min) | 23 | $1,730 | $67 |
| Return visit (30+ min) | 17 | $1,412 | $83 |
2016: 5 services
| Test for allergy using allergenic extract | 28 | $7,757 | $7 |
| New patient visit (30+ min) | 37 | $3,442 | $93 |
| Return visit (30+ min) | 20 | $2,256 | $90 |
| New patient visit (45+ min) | 11 | $1,643 | $149 |
| Short return visit (20+ min) | 20 | $1,480 | $64 |
Drugs they prescribed that Part D paid
$260,212
Pharmacies billed $260,212 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 0% of their Part D prescriptions (0 of 345) in 2024. At or below the middle of the specialty; the typical allergy/ immunology clinician is at 0%.
214 generic and 131 brand-name prescriptions · $260,212 in drug cost · 17 antibiotic prescriptions to 12 people.
Part D prescriptions only. The opioid rate is opioid prescriptions as a share of all this clinician's Part D prescriptions; surgeons and pain specialists run higher than others, so it is shown against the same specialty.
| Dupixent | 27 | $98,341 | $3,642 |
| Dupixent | 13 | $57,340 | $4,411 |
| Tezspire | 12 | $53,379 | $4,448 |
| Azelastine-Fluticasone | 17 | $1,750 | $103 |
| Azelastine | 39 | $1,250 | $32 |
See all 10 drugs
| Dupixent | 27 | $98,341 | $3,642 |
| Dupixent | 13 | $57,340 | $4,411 |
| Tezspire | 12 | $53,379 | $4,448 |
| Azelastine-Fluticasone | 17 | $1,750 | $103 |
| Azelastine | 39 | $1,250 | $32 |
| Ipratropium | 32 | $1,197 | $37 |
| Flunisolide | 16 | $1,146 | $72 |
| Epinastine | 15 | $1,007 | $67 |
| Fluticasone Propionate | 21 | $575 | $27 |
| Albuterol Sulfate Hfa | 12 | $245 | $20 |
Year by year
| 2024 | 345 | 75 | 0% (0) | 38% | $260,212 |
| 2023 | 380 | 70 | 0% (0) | 41% | $198,237 |
| 2022 | 251 | 58 | 0% (0) | 39% | $110,968 |
| 2021 | 215 | 51 | 0% (0) | 39% | $85,678 |
| 2020 | 289 | 61 | 0% (0) | 44% | $99,276 |
| 2019 | 312 | 79 | None | 32% | $64,722 |
| 2018 | 285 | 72 | 0% (0) | 36% | $35,378 |
| 2017 | 168 | 62 | 0% (0) | 23% | $28,225 |
| 2016 | 162 | 45 | 0% (0) | 27% | $14,902 |
| 2015 | 89 | 45 | None | 44% | $15,486 |
| 2014 | 65 | 23 | None | 22% | $5,522 |
| 2013 | 114 | 74 | None | 27% | $5,146 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 13 drugs
| Dupixent | 19 | $70,266 | $3,698 |
| Dupixent | 14 | $54,790 | $3,914 |
| Spiriva Respimat | 18 | $11,404 | $634 |
| Trelegy Ellipta | 11 | $10,232 | $930 |
| Dulera | 13 | $4,871 | $375 |
| Fluticasone-Salmeterol | 12 | $3,769 | $314 |
| Flovent Hfa | 12 | $3,556 | $296 |
| Epinephrine | 15 | $2,896 | $193 |
| Azelastine | 38 | $2,145 | $56 |
| Ipratropium | 29 | $1,153 | $40 |
| Fluticasone Propionate | 21 | $799 | $38 |
| Albuterol Sulfate Hfa | 16 | $463 | $29 |
| Montelukast | 19 | $198 | $10 |
2022: 10 drugs
| Dupixent | 14 | $48,412 | $3,458 |
| Spiriva Respimat | 12 | $6,382 | $532 |
| Dulera | 12 | $3,976 | $331 |
| Fluocinonide | 12 | $2,736 | $228 |
| Azelastine | 34 | $2,585 | $76 |
| Ipratropium | 11 | $682 | $62 |
| Levocetirizine Dihydrochloride | 11 | $676 | $61 |
| Albuterol Sulfate Hfa | 11 | $540 | $49 |
| Montelukast | 20 | $247 | $12 |
| Fluticasone Propionate | 12 | $163 | $14 |
2021: 4 drugs
| Spiriva Respimat | 11 | $5,487 | $499 |
| Fluocinonide | 14 | $2,323 | $166 |
| Azelastine | 17 | $665 | $39 |
| Montelukast | 25 | $412 | $16 |
2020: 5 drugs
| Spiriva Respimat | 20 | $9,315 | $466 |
| Qvar Redihaler | 11 | $2,752 | $250 |
| Ipratropium | 11 | $1,812 | $165 |
| Azelastine | 25 | $1,229 | $49 |
| Montelukast | 36 | $584 | $16 |
2019: 8 drugs
| Spiriva | 21 | $11,023 | $525 |
| Azelastine | 44 | $1,800 | $41 |
| Fluocinonide | 12 | $1,504 | $125 |
| Ipratropium | 23 | $924 | $40 |
| Montelukast | 23 | $655 | $28 |
| Fluticasone Propionate | 12 | $206 | $17 |
| Hydroxyzine | 13 | $172 | $13 |
| Prednisone | 11 | $30 | $3 |
2018: 8 drugs
| Flovent Hfa | 17 | $4,358 | $256 |
| Symbicort | 14 | $4,262 | $304 |
| Epinephrine | 13 | $2,938 | $226 |
| Dymista | 11 | $2,232 | $203 |
| Ipratropium | 23 | $1,449 | $63 |
| Azelastine | 39 | $1,407 | $36 |
| Montelukast | 41 | $737 | $18 |
| Prednisone | 19 | $67 | $4 |
2017: 4 drugs
| Ipratropium | 28 | $2,296 | $82 |
| Azelastine | 14 | $523 | $37 |
| Montelukast | 14 | $313 | $22 |
| Prednisone | 12 | $40 | $3 |
2016: 3 drugs
| Azelastine | 42 | $1,581 | $38 |
| Ipratropium | 22 | $923 | $42 |
| Montelukast | 16 | $189 | $12 |
2015: 1 drug
| Nexium | 11 | $5,440 | $495 |
Money from drug and device companies
$12 in 2021
| 2021 | 1 | 1 | None | $12 |
| 2019 | 1 | 1 | None | $19 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| GlaxoSmithKline | Nucala | $12 | 1 payment
|
See the published payment
| GlaxoSmithKline | Meals · 2021-11-12 | Nucala | $12 |
See earlier years (2019)
2019: $19
| Hologic | Fluent | $19 | 1 payment
|
Professional record
- NPI
- 1518260306
- Licence
- CA A115080California A115080: Current · expires 2028-06-30
- Video visits
- Lists video visits
- Gender
- Male
More record details
- Sole proprietor
- No
- Taxonomy
- Federal specialty code 207K00000X (207K00000X); Internal medicine (207R00000X)
- Mailing address
- 2350 W. El Camino Real, 2nd Floor, Mountain View, CA, 94040
- NPI first listed
- 2010-12-16
- NPI last updated
- 2015-09-23
This is when the NPI record was last certified, not a medical board exam.