Ma Hazelene Merluza Pareja, PA
Physician Assistant · Stanford
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- Not verified
- Not the same as out of network.
- Offices
- 3
Offices
3 locations · Stanford Health Care · Dignity Health Medical Foundation
Looking this up.
Hospitals listed: Sequoia Hospital. 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 Ma Hazelene Merluza Pareja’s office 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.
- Sequoia HospitalRedwood City, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of CommonSpirit Health, which runs 145 hospitals in 19 statesPatients rate it 4 of 5 · 81% would definitely recommend itOverall rating: 5 of 5 starsBetter than the national rate — Death rate among surgical inpatients with serious treatable complications: 104.12 (51.8 to 156.44) · 56 cases, Jul 2022 – Jun 2024Better than the national rate — Clostridium Difficile (C.Diff): 0, Oct 2024 – Sep 2025
See every measure and the patient survey for Sequoia Hospital
Behind the star rating — Deaths: 2 better, 6 the same, 0 worse of 8 measures. Safety: 1 better, 4 the same, 0 worse of 5 measures. Readmissions: 3 better, 6 the same, 0 worse of 9 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.
| Death rate among surgical inpatients with serious treatable complicationsComplications and deaths | 104.12 (51.8 to 156.44) · 56 cases | Better | Jul 2022 – Jun 2024 |
| Clostridium Difficile (C.Diff)Infections | 0 | Better | Oct 2024 – Sep 2025 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 0.95 (0 to 1.98) · 472 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 0.91 (0.58 to 1.24) | No different | Jul 2022 – Jun 2024 |
| Death rate for CABG surgery patientsComplications and deaths | 1.8 · 68 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart attack patientsComplications and deaths | 12.5 · 72 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart failure patientsComplications and deaths | 9.1 · 258 cases | None | Jul 2022 – Jun 2025 |
| Death rate for pneumonia patientsComplications and deaths | 15.5 · 171 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 9.3 · 81 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 3.2 · 1,231 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.23 (0.01 to 0.44) · 3,018 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.23 (0.03 to 0.44) · 3,164 cases | No different | Jul 2022 – Jun 2024 |
| Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths | 2.59 (0.47 to 4.71) · 1,402 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 1.47 (0.04 to 2.9) · 926 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 1.68 (0.21 to 3.16) · 1,310 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative respiratory failure rateComplications and deaths | 9.54 (4.42 to 14.67) · 978 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 4.98 (1.61 to 8.36) · 924 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.69 (0.19 to 3.19) · 192 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.57 (0 to 1.43) · 2,501 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 3.5 · 332 cases | None | Apr 2023 – Mar 2025 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.702 | No different | Oct 2024 – Sep 2025 |
| SSI - Colon SurgeryInfections | 0.853 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 14.2 · 67 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 22.3 · 295 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for heart attack patientsUnplanned return visits | -27.1 · 76 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for heart failure patientsUnplanned return visits | -22.3 · 304 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | -4.6 · 178 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 17.3 · 180 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 5.1 · 305 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for CABGUnplanned return visits | 10.9 · 41 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 19.7 · 29 cases | None | Jul 2023 – Jun 2025 |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits | 13.1 (9.7 to 17.7) · 129 cases | No different | Jan 2022 – Dec 2024 |
| Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits | 0.9 (0.7 to 1.2) · 713 cases | No different | Jan 2024 – Dec 2024 |
What patients said (631 patients answered, 27% of those asked)
| Cleanliness | 4 |
| Nurse communication | 4 |
| Doctor communication | 4 |
| Communication about medicines | 3 |
| Discharge information | 4 |
| Overall hospital rating | 4 |
| Quietness | 3 |
| Recommend hospital | 5 |
| Room was "always" clean | 78% |
| Nurses "always" communicated well | 80% |
| Doctors "always" communicated well | 82% |
| Staff "always" explained | 60% |
| Yes, staff "did" give patients this information | 88% |
| Yes, staff "did" give patients information about help after discharge | 86% |
| Doctors "always" explained things so they could understand | 76% |
| Doctors "always" listened carefully | 81% |
| Doctors "always" treated them with courtesy and respect | 89% |
| Patients who gave a rating of "9" or "10" (high) | 77% |
| Staff "always" explained new medications | 76% |
| Nurses "always" explained things so they could understand | 77% |
| Nurses "always" listened carefully | 77% |
| Nurses "always" treated them with courtesy and respect | 88% |
| "Always" quiet at night | 55% |
| "YES", patients would definitely recommend the hospital | 81% |
| Staff "always" explained possible side effects | 44% |
| Yes, staff "did" give patients information about possible symptoms | 91% |
Original Medicare doctor bills
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
Procedures Medicare counted
| Prostate resection | 1-10 | None |
Drugs they prescribed that Part D paid
$2,653
Pharmacies billed $2,653 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 49) in 2024. Too few prescriptions to compare fairly with other clinicians.
41 generic and fewer than 11 brand-name prescriptions · $2,653 in drug cost.
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.
| Estradiol | 11 | $1,017 | $92 |
Year by year
| 2024 | 49 | 27 | 0% (0) | None | $2,653 |
| 2023 | 53 | 31 | 0% (0) | None | $4,419 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 1 drug
| Estradiol | 13 | $1,984 | $153 |
Money from drug and device companies
$16 in 2025
| 2025 | 1 | 1 | None | $16 |
| 2024 | 8 | 18 | None | $673 |
| 2023 | 9 | 12 | None | $371 |
| 2022 | 3 | 6 | None | $142 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Intuitive Surgical | Da Vinci Surgical System | $16 | 1 payment
|
See the published payment
| Intuitive Surgical | Meals · 2025-07-22 | Da Vinci Surgical System | $16 |
See earlier years (2024, 2023, 2022)
2024: $673
| Astellas Pharma US | Veozah | $200 | 2 payments
|
| Hologic Sales and Service | Acessa Provu System | $196 | 3 payments
|
| Biogen | Zurzuvae | $82 | 4 payments
|
| Organon | Nexplanon | $66 | 3 payments
|
| Lilly USA | Jardiance | $44 | 2 payments
|
| Millicent US | Femring | $41 | 2 payments
|
| Evofem Biosciences | None | $22 | 1 payment
|
| Amgen | Evenity | $22 | 1 payment
|
2023: $371
| Myriad Women's Health | None | $108 | 1 payment
|
| Amgen | Evenity | $79 | 3 payments
|
| Exact Sciences | Cologuard Collection Kit | $46 | 2 payments
|
| Pfizer | Comirnaty | $28 | 1 payment
|
| Hologic Sales and Service | Aptima | $27 | 1 payment
|
| Organon | Nexplanon | $26 | 1 payment
|
| Abbvie | Orilissa | $26 | 1 payment
|
| Evofem Biosciences | Phexxi | $19 | 1 payment
|
| Astellas Pharma US | Veozah | $14 | 1 payment
|
2022: $142
| Hologic | Thinprep 2000 Processor | $63 | 2 payments
|
| Abbvie | Lo Loestrin Fe | $57 | 3 payments
|
| TherapeuticsMD | Annovera | $22 | 1 payment
|
Professional record
- NPI
- 1427786276
- Group
- Stanford Health Care · Dignity Health Medical Foundation
- Video visits
- Lists video visits
- Gender
- Female
More record details
- Sole proprietor
- No
- Taxonomy
- Physician assistant (363A00000X)
- Mailing address
- 300 Pasteur Dr, Stanford, CA, 94305
- NPI first listed
- 2022-08-10
- NPI last updated
- 2025-11-11
- NPI record certified
- 2025-11-11
This is when the NPI record was last certified, not a medical board exam.
Extra NPI addresses: 2900 Whipple Ave Ste 132, Redwood City, CA, 94062