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Sofia E Posada, PA

Physician Assistant · Stanford

NPI 1891715736

Medicare standing
Clear
Enrolled, allowed to bill and order, not excluded
Plans that list them
Not verified
Not the same as out of network.
Office
1
Since medical school
23 years
Graduated 2003

Offices

1 location · Stanford Health Care · 3,152 clinicians in this group

Looking this up.

Hospitals listed: Stanford Health Care. That is not proof they admit you there this week.

Plan participation

Not verified

We could not verify current plan participation for this doctor. This does not mean they are out of network. Call Sofia E Posada’s office at (650) 723-4000 to ask if they take your plan before you enroll.

Hospitals they work in

1 hospital

These rate the hospital, not this clinician. Most measures at most hospitals are no different from the national rate.

  • Stanford Health CareStanford, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency departmentPart of Stanford Health Care, which runs 3 hospitalsHome of Stanford Cancer Institute, a National Cancer Institute designated comprehensive cancer centrePatients rate it 4 of 5 · 83% would definitely recommend it
    Overall rating: 5 of 5 starsWorse than the national rate — Perioperative pulmonary embolism or deep vein thrombosis rate: 5.31 (4.24 to 6.37) · 8,661 cases, Jul 2022 – Jun 2024Worse than the national rate — Rate of inpatient admissions for patients receiving outpatient chemotherapy: 14.1 (12.7 to 15.7) · 2,191 cases, Jan 2024 – Dec 2024Better than the national rate — Postoperative respiratory failure rate: 4.08 (1.95 to 6.21) · 5,296 cases, Jul 2022 – Jun 2024Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.317, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.446, Oct 2024 – Sep 2025Better than the national rate — SSI - Colon Surgery: 0.241, Oct 2024 – Sep 2025Better than the national rate — Ratio of unplanned hospital visits after hospital outpatient surgery: 0.7 (0.6 to 0.9) · 3,348 cases, Jan 2024 – Dec 2024
See every measure and the patient survey for Stanford Health Care

Behind the star rating — Deaths: 5 better, 3 the same, 0 worse of 8 measures. Safety: 3 better, 5 the same, 0 worse of 8 measures. Readmissions: 2 better, 5 the same, 4 worse of 11 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.

Every scored measure at Stanford Health Care
Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths5.31 (4.24 to 6.37) · 8,661 casesWorseJul 2022 – Jun 2024
Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits14.1 (12.7 to 15.7) · 2,191 casesWorseJan 2024 – Dec 2024
Postoperative respiratory failure rateComplications and deaths4.08 (1.95 to 6.21) · 5,296 casesBetterJul 2022 – Jun 2024
Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections0.317BetterOct 2024 – Sep 2025
Clostridium Difficile (C.Diff)Infections0.446BetterOct 2024 – Sep 2025
SSI - Colon SurgeryInfections0.241BetterOct 2024 – Sep 2025
Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits0.7 (0.6 to 0.9) · 3,348 casesBetterJan 2024 – Dec 2024
Abdominopelvic accidental puncture or laceration rateComplications and deaths1.06 (0.45 to 1.67) · 5,374 casesNo differentJul 2022 – Jun 2024
CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths0.86 (0.72 to 1)No differentJul 2022 – Jun 2024
Death rate among surgical inpatients with serious treatable complicationsComplications and deaths166.09 (137.88 to 194.3) · 470 casesNo differentJul 2022 – Jun 2024
Death rate for CABG surgery patientsComplications and deaths1.1 · 192 casesNoneJul 2022 – Jun 2025
Death rate for COPD patientsComplications and deaths6.4 · 146 casesNoneJul 2022 – Jun 2025
Death rate for heart attack patientsComplications and deaths9.7 · 253 casesNoneJul 2022 – Jun 2025
Death rate for heart failure patientsComplications and deaths6.3 · 880 casesNoneJul 2022 – Jun 2025
Death rate for pneumonia patientsComplications and deaths10.3 · 935 casesNoneJul 2022 – Jun 2025
Death rate for stroke patientsComplications and deaths8.7 · 501 casesNoneJul 2023 – Jun 2025
Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths2.1 · 7,730 casesNoneJul 2024 – Jun 2025
Iatrogenic pneumothorax rateComplications and deaths0.13 (0 to 0.27) · 20,799 casesNo differentJul 2022 – Jun 2024
In-hospital fall-associated fracture rateComplications and deaths0.28 (0.14 to 0.43) · 23,182 casesNo differentJul 2022 – Jun 2024
Postoperative acute kidney injury requiring dialysis rateComplications and deaths0.94 (0.2 to 1.68) · 5,694 casesNo differentJul 2022 – Jun 2024
Postoperative hemorrhage or hematoma rateComplications and deaths2.36 (1.54 to 3.19) · 7,846 casesNo differentJul 2022 – Jun 2024
Postoperative sepsis rateComplications and deaths5.2 (3.76 to 6.64) · 5,603 casesNo differentJul 2022 – Jun 2024
Postoperative wound dehiscence rateComplications and deaths1.38 (0.23 to 2.53) · 2,211 casesNo differentJul 2022 – Jun 2024
Pressure ulcer rateComplications and deaths0.52 (0.21 to 0.83) · 19,915 casesNo differentJul 2022 – Jun 2024
Rate of complications for hip/knee replacement patientsComplications and deaths3.6 · 416 casesNoneApr 2023 – Mar 2025
Central Line Associated Bloodstream Infection (ICU + select Wards)Infections0.869No differentOct 2024 – Sep 2025
MRSA BacteremiaInfections0.857No differentOct 2024 – Sep 2025
SSI - Abdominal HysterectomyInfections0.368No differentOct 2024 – Sep 2025
Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits16.2 · 247 casesNoneJul 2023 – Jun 2025
Heart failure (HF) 30-Day Readmission RateUnplanned return visits20.5 · 1,021 casesNoneJul 2023 – Jun 2025
Hospital return days for heart attack patientsUnplanned return visits47.8 · 258 casesNoneJul 2022 – Jun 2025
Hospital return days for heart failure patientsUnplanned return visits-1.6 · 990 casesNoneJul 2022 – Jun 2025
Hospital return days for pneumonia patientsUnplanned return visits20.8 · 976 casesNoneJul 2022 – Jun 2025
Pneumonia (PN) 30-Day Readmission RateUnplanned return visits16.5 · 959 casesNoneJul 2023 – Jun 2025
Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits5.2 (4.4 to 6.2) · 2,191 casesNo differentJan 2024 – Dec 2024
Rate of readmission after hip/knee replacementUnplanned return visits5.1 · 425 casesNoneJul 2023 – Jun 2025
Rate of readmission for CABGUnplanned return visits9.6 · 158 casesNoneJul 2023 – Jun 2025
Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits19.6 · 183 casesNoneJul 2023 – Jun 2025
Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits12.7 (10.4 to 15.4) · 4,578 casesNo differentJan 2022 – Dec 2024

What patients said (6,810 patients answered, 25% of those asked)

Patient survey stars by topic at Stanford Health Care
Cleanliness4
Nurse communication4
Doctor communication4
Communication about medicines3
Discharge information4
Overall hospital rating4
Quietness2
Recommend hospital5
Share of patients giving the best answer at Stanford Health Care
Room was "always" clean75%
Nurses "always" communicated well82%
Doctors "always" communicated well81%
Staff "always" explained63%
Yes, staff "did" give patients this information89%
Yes, staff "did" give patients information about help after discharge89%
Doctors "always" explained things so they could understand76%
Doctors "always" listened carefully80%
Doctors "always" treated them with courtesy and respect87%
Patients who gave a rating of "9" or "10" (high)79%
Staff "always" explained new medications76%
Nurses "always" explained things so they could understand77%
Nurses "always" listened carefully79%
Nurses "always" treated them with courtesy and respect88%
"Always" quiet at night53%
"YES", patients would definitely recommend the hospital83%
Staff "always" explained possible side effects50%
Yes, staff "did" give patients information about possible symptoms90%

Original Medicare doctor bills

$17,397

Medicare paid this office $17,397 for 195 people.

This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.

Largest Original Medicare bills
Return visit (30+ min)125$11,778$91
New patient visit (30+ min)39$3,045$78
Short return visit (20+ min)26$1,766$68

Who their Medicare patients are

195 Original Medicare patients in 2024. Average age 73 · Under 65 10% · 85 and older 9% · Women 65% · Also on Medicaid 20% · Health risk score 1.25. At or below the middle of the specialty; the typical physician assistant clinician is at 1.31.

Conditions among them: High blood pressure 61% · Diabetes 28% · Coronary heart disease 22% · Chronic kidney disease 22% · Cancer 22% · Depression 22% · Atrial fibrillation 16% · Heart failure 11% · Stroke 11% · COPD 9%.

The office billed $103,927, Medicare allowed $24,747 and paid $17,397; for 211 services of 9 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

Original Medicare by year
2024195211731.25$103,927$17,397
2023181250731.54$121,412$17,311
2022209324731.24$148,944$21,383
2021214336721.35$119,605$18,223
2020145204741.46$71,512$10,262
2019110125701.67$85,784$8,038
201897125681.79$74,466$8,265
201795117731.62$37,755$5,912
20168086681.38$17,179$4,472

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: 5 services

Original Medicare services billed in 2023
Return visit (30+ min)95$9,138$89
New patient visit (30+ min)35$2,969$85
Return visit (30+ min)27$1,908$71
Short return visit (20+ min)19$1,373$72
Telehealth originating site facility fee43$954$22

2022: 5 services

Original Medicare services billed in 2022
Return visit (30+ min)106$10,811$96
New patient visit (30+ min)51$4,203$82
Telehealth originating site facility fee92$2,041$21
Short return visit (20+ min)26$1,844$71
Return visit (30+ min)16$1,331$78

2021: 6 services

Original Medicare services billed in 2021
Short return visit (20+ min)89$6,204$67
Return visit (30+ min)34$3,748$110
New patient visit (30+ min)35$2,525$72
Telehealth originating site facility fee106$2,094$19
Short return visit (20+ min)28$1,415$49
Telephone medical discussion with physician, 11-20 minutes15$1,092$68

2020: 6 services

Original Medicare services billed in 2020
Short return visit (20+ min)45$2,724$59
New patient visit (30+ min)20$1,440$72
New patient visit (30+ min)19$1,165$61
Return visit (30+ min)16$1,064$67
Telehealth originating site facility fee44$989$22
Short return visit (20+ min)24$955$40

2019: 3 services

Original Medicare services billed in 2019
Return visit (30+ min)55$4,458$78
Short return visit (20+ min)27$1,523$56
New patient visit (30+ min)25$1,347$54

2018: 2 services

Original Medicare services billed in 2018
Return visit (30+ min)79$6,657$76
New patient visit (30+ min)13$899$69

2017: 2 services

Original Medicare services billed in 2017
Return visit (30+ min)36$2,964$80
Short return visit (20+ min)60$2,207$34

2016: 1 service

Original Medicare services billed in 2016
Short return visit (20+ min)78$4,334$53

Drugs they prescribed that Part D paid

$2,667

Pharmacies billed $2,667 in 2024.

This is pharmacy cost, not the office bill, and not what patients paid.

103 generic and fewer than 11 brand-name prescriptions · $2,667 in drug cost · 59 antibiotic prescriptions to 55 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.

Largest Part D drug costs
Paxlovid17$1,429$84
Cephalexin16$100$6
Amoxicillin11$46$4

Year by year

Part D prescribing by year
2024129106NoneNone$2,667
2023139990% (0)None$6,551
2022146100None10%$5,853
202112092NoneNone$2,565
20207460NoneNone$1,159
20198968None16%$2,026
201810972NoneNone$3,319
201711868None22%$2,993
201620482None10%$4,466
2015735132NoneNone$32,120
20142,3483351% (11)28%$179,218
20134,7564770% (13)31%$332,059

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

See the drugs prescribed each year

2023: 2 drugs

Part D drugs prescribed in 2023
Albuterol Sulfate Hfa12$368$31
Cephalexin12$71$6

2022: 1 drug

Part D drugs prescribed in 2022
Cephalexin20$120$6

2021: 1 drug

Part D drugs prescribed in 2021
Cephalexin18$149$8

2020: 1 drug

Part D drugs prescribed in 2020
Cephalexin13$61$5

2019: 1 drug

Part D drugs prescribed in 2019
Cephalexin12$78$6

2018: 1 drug

Part D drugs prescribed in 2018
Azithromycin15$93$6

2017: 2 drugs

Part D drugs prescribed in 2017
Nitrofurantoin Mono-Macro11$282$26
Azithromycin16$86$5

2016: 4 drugs

Part D drugs prescribed in 2016
Omeprazole16$140$9
Lisinopril17$70$4
Losartan16$61$4
Amlodipine Besylate12$38$3

2015: 15 drugs

Part D drugs prescribed in 2015
Januvia28$10,200$364
Proair Hfa24$1,601$67
Valsartan15$939$63
Tamsulosin19$676$36
Omeprazole66$617$9
Simvastatin44$365$8
Losartan49$330$7
Amlodipine Besylate41$182$4
Atorvastatin22$182$8
Lisinopril34$174$5
Allopurinol13$172$13
Metformin24$128$5
Meloxicam17$50$3
Hydrochlorothiazide17$49$3
Metoprolol11$38$3

2014: 50 drugs

Part D drugs prescribed in 2014
Januvia57$25,977$456
Crestor46$11,522$250
Diovan45$11,296$251
Lantus34$8,672$255
Humalog16$6,868$429
Lantus Solostar18$5,954$331
Duloxetine12$5,133$428
Avodart19$4,287$226
Novolog Flexpen13$3,629$279
Namenda18$3,310$184
Pioglitazone39$3,215$82
Exforge11$2,178$198
Levothyroxine108$2,073$19
Tamsulosin38$1,560$41
Omeprazole119$1,542$13
Valsartan-Hydrochlorothiazide28$1,370$49
Losartan103$1,336$13
Proair Hfa18$1,129$63
Metformin107$1,090$10
Atorvastatin50$1,082$22
Amlodipine Besylate141$1,002$7
Hydralazine35$972$28
Simvastatin97$887$9
Lisinopril86$817$10
Pravastatin20$691$35
Glyburide24$650$27
Metoprolol25$633$25
Clopidogrel33$579$18
Hydrochlorothiazide69$493$7
Bd Ultra-Fine Pen Needle13$470$36
Montelukast12$465$39
Gabapentin25$359$14
Mirtazapine26$350$13
Furosemide74$343$5
Metoprolol42$338$8
Isosorbide Mononitrate Er16$335$21
Carvedilol35$308$9
Triamcinolone Acetonide17$302$18
Alendronate32$297$9
Allopurinol26$258$10
Atenolol42$240$6
Pantoprazole11$204$19
Glipizide20$155$8
Glimepiride13$127$10
Ibuprofen17$123$7
Sertraline13$122$9
Citalopram Hbr24$112$5
Amitriptyline14$105$8
Lovastatin13$102$8
Famotidine13$95$7

2013: 83 drugs

Part D drugs prescribed in 2013
Januvia117$41,056$351
Crestor106$23,395$221
Diovan128$22,875$179
Victoza 3-Pak21$10,449$498
Lantus38$9,086$239
Exforge35$7,564$216
Dexilant36$7,280$202
Novolog Flexpen20$6,710$336
Nexium11$6,136$558
Avodart33$5,571$169
Benicar24$5,404$225
Onglyza15$4,824$322
Cymbalta14$4,745$339
Voltaren48$4,616$96
Humalog14$4,277$306
Aciphex12$4,073$339
Namenda15$3,977$265
Clopidogrel58$3,713$64
Levemir Flexpen18$3,532$196
Spiriva11$3,496$318
Lantus Solostar13$3,045$234
Valsartan-Hydrochlorothiazide40$2,967$74
Diovan Hct17$2,958$174
Colcrys16$2,889$181
Pioglitazone21$2,807$134
Clonidine17$2,659$156
Bystolic25$2,574$103
Atorvastatin71$2,124$30
Losartan112$2,102$19
Omeprazole143$2,005$14
Levothyroxine179$1,931$11
Lisinopril251$1,871$7
Amlodipine Besylate226$1,712$8
Glyburide60$1,651$28
Metformin213$1,621$8
Simvastatin192$1,579$8
Econazole Nitrate62$1,564$25
Tamsulosin61$1,517$25
Hydralazine64$1,427$22
Fenofibrate14$1,313$94
Proair Hfa19$1,154$61
Clobetasol Propionate35$1,153$33
Gabapentin55$1,152$21
Montelukast27$1,038$38
Mirtazapine75$988$13
Metoprolol21$914$44
Hydrochlorothiazide105$822$8
Escitalopram11$802$73
Labetalol26$779$30
Isosorbide Mononitrate Er39$768$20
Furosemide168$742$4
Polyethylene Glycol 335034$741$22
Clotrimazole-Betamethasone13$674$52
Pantoprazole26$585$23
Carvedilol67$581$9
Metoprolol106$567$5
Potassium Chloride25$528$21
Triamcinolone Acetonide35$493$14
Azithromycin44$428$10
Alendronate47$414$9
Glipizide47$364$8
Sertraline34$363$11
Terbinafine16$362$23
Glimepiride37$341$9
Levofloxacin17$299$18
Atenolol51$298$6
Famotidine34$290$9
Benazepril24$269$11
Fosinopril15$265$18
Ammonium Lactate12$253$21
Allopurinol32$246$8
Paroxetine11$240$22
Ciprofloxacin25$225$9
Lovastatin19$221$12
Ibuprofen34$186$5
Meloxicam29$180$6
Warfarin12$133$11
Prednisone43$129$3
Fluoxetine17$109$6
Fluconazole22$109$5
Tramadol11$107$10
Amoxicillin17$96$6
Amitriptyline12$43$4

Money from drug and device companies

$112 in 2024

A payment is not proof that care is biased.

Payments by company
EMD SeronoNone$112
1 payment
  • Meals · 2024-02-13 · $112
See the published payment
Every published payment
EMD SeronoMeals · 2024-02-13None$112

Checkups this office reported

Medicare did not publish checkup rates for this clinician.

Medicare’s overall office score
76.5 / 100
Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.

Professional record

NPI
1891715736
Licence
CA PA17402
Video visits
Lists video visits
Gender
Female
More record details
Sole proprietor
No
Taxonomy
Physician assistant (363A00000X); Physician assistant, medical (363AM0700X)
Mailing address
300 Pasteur Dr, Stanford, CA, 94305
NPI first listed
2006-07-21
NPI last updated
2025-12-23
NPI record certified
2025-12-23

This is when the NPI record was last certified, not a medical board exam.