Hayley Ilene Risse , PA
Physician Assistant β’ Fairfield, CA
1860 Pennsylvania Ave Ste 110
Fairfield, CA 945333550
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on March 10, 2022; this date does not establish years in practice.
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Published CMS data list 1,666 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Levothyroxine Sodium β 161 prescription fills, including refills.
- Atorvastatin Calcium β 118 prescription fills, including refills.
- Mounjaro (Tirzepatide) β 116 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 46 records in the table Β· Guide: How to read Medicare Part D prescriber data
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More Part D prescriptions than 95% of clinicians listed under Physician Assistant in Fairfield, CA (2024, 21 clinicians with data). Median for this group: 265. Middle half: 87 to 704.
More Part D prescriptions than 85% of clinicians listed under Physician Assistant in California (2024, 7,516 clinicians with data). Median for this group: 229. Middle half: 72 to 718.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 103 in 2023 to 1,666 in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2023β2024.
Practice Location & Contact Primary Location
1860 Pennsylvania Ave Ste 110
Fairfield, CA 945333550
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
3,887 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$715,636 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $125.24 across 5 records.
By nature of payment
- Food and Beverage: $125.24 across 5 records.
Reporting-company totals (3 largest of 5)
- Ascendis Pharma Endocrinology Inc: $28.31 across 1 record.
- Amgen Inc.: $27.24 across 1 record.
- Medtronic, Inc.: $24.52 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
NPI first issued
2022
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Hayley Risse has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Hayley Risse as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Fairfield and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Physician Assistant in Fairfield, CA (2024, 21 clinicians with data). Median for this group: 265. Middle half: 87 to 704.
More Part D prescriptions than 85% of clinicians listed under Physician Assistant in California (2024, 7,516 clinicians with data). Median for this group: 229. Middle half: 72 to 718.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in Fairfield, CA (2024, 21 clinicians with data). Median for this group: $21,128. Middle half: $1,030 to $191,931.
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in California (2024, 7,516 clinicians with data). Median for this group: $3,945. Middle half: $709 to $60,209.
36 active clinicians are listed under Physician Assistant with a practice address in Fairfield, CA (14,458 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Fairfield
16.7% of these 36 clinicians have the CMS telehealth indicator.
47.2% of these 36 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 1517% from 103 in 2023 to 1,666 in 2024.
- 2023: 103
- 2024: 1,666
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30-day fills
30-day fills increased 1561% from 234 in 2023 to 3,887 in 2024.
- 2023: 234
- 2024: 3,887
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Part D drug cost
Part D drug cost increased 1394% from $47,913 in 2023 to $715,636 in 2024.
- 2023: $47,913
- 2024: $715,636
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $469.07 in 2023 to $125.24 in 2025.
- 2023: $469.07
- 2024: $1,267.66
- 2025: $125.24
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 β December 31, 2025): fewer than 11 records totaling $125.24.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Ascendis Pharma Endocrinology Inc |
Food and Beverage
In-kind items and services
|
Yorvipath | General | $28.31 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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TEPEZZA | General | $27.24 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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INCEPTIV | General | $24.52 |
| Boehringer Ingelheim Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
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JARDIANCE | General | $23.95 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
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MOUNJARO | General | $21.22 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Levothyroxine Sodium | Levothyroxine Sodium | 161 | 12,334 | $1,694.37 | 62 |
| Atorvastatin Calcium | Atorvastatin Calcium | 118 | 9,156 | $1,274.32 | 50 |
| Mounjaro | Tirzepatide | 116 | 4,464 | $163,804.65 | 30 |
| Ozempic | Semaglutide | 88 | 4,025 | $120,780.40 | 29 |
| Lisinopril | Lisinopril | 84 | 6,860 | $643.61 | 31 |
| Metformin Hcl Er | Metformin Hcl | 77 | 5,888 | $804.36 | 30 |
| Metformin Hcl | Metformin Hcl | 66 | 4,996 | $355.47 | 26 |
| Amlodipine Besylate | Amlodipine Besylate | 64 | 5,600 | $398.15 | 28 |
| Lantus Solostar | Insulin Glargine,hum.Rec.Anlog | 62 | 4,374 | $9,810.10 | 24 |
| Jardiance | Empagliflozin | 60 | 4,212 | $79,754.82 | 24 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 58 | 4,980 | $1,180.76 | 22 |
| Liothyronine Sodium | Liothyronine Sodium | 41 | 3,510 | $1,627.51 | 17 |
| Losartan Potassium | Losartan Potassium | 38 | 3,092 | $232.82 | 14 |
| Trulicity | Dulaglutide | 35 | 1,764 | $60,702.11 | β |
| Synthroid | Levothyroxine Sodium | 32 | 2,724 | $3,710.53 | 13 |
| Rybelsus | Semaglutide | 28 | 1,620 | $49,296.06 | 11 |
| Omeprazole | Omeprazole | 27 | 2,094 | $638.59 | 11 |
| Methimazole | Methimazole | 27 | 2,269 | $395.92 | β |
| Tamsulosin Hcl | Tamsulosin Hcl | 26 | 1,680 | $166.47 | β |
| Humalog Kwikpen U-100 | Insulin Lispro | 26 | 1,672 | $7,954.21 | β |
| Tymlos | Abaloparatide | 25 | 738 | $65,855.84 | β |
| Glipizide | Glipizide | 24 | 2,190 | $161.91 | 11 |
| Gabapentin | Gabapentin | 23 | 1,425 | $366.79 | β |
| Farxiga | Dapagliflozin Propanediol | 22 | 1,950 | $36,268.48 | β |
| Hydrochlorothiazide | Hydrochlorothiazide | 21 | 1,900 | $146.78 | β |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-07-24NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20220330001271
CA
0345636411
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine - Endocrinology, Diabetes & Metabolism
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 1860 PENNSYLVANIA AVE STE 110, FAIRFIELD, CA 945333550 (Tel: 7076464692)
Recorded as HAYLEY RISSE, PA
Registered at 1620 PENNSYLVANIA AVE STE B, FAIRFIELD, CA 945333509 (Tel: 9256854224)
NPI status registered as active in NPPES database
Registered at 2970 HILLTOP MALL RD STE 203, RICHMOND, CA 948061949 (Tel: 5102228000)
Registered at 782 BRAYDON PL UNIT 203, NAPA, CA 945593070
Recorded as HAYLEY RAPPOPORT, PA
Physician Assistant
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Fairfield
- Christine Knob, PHYSICIAN ASSISTANT
- Shannon Malouf, PA-C
- Mara Adelman, PHYSICIANS ASST PA
- Lyubov Lupyan-Teytelman, PA
- Judith Flandez, PA-C
- Shavana Turay, PA
Mailing Address
782 Braydon Pl Unit 203
Napa, CA 945593070