Dr. Irwin H. Koff , MD
General Practice • Honolulu, HI
915 N King St
Honolulu, HI 968174544
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 October 23, 2006; this date does not establish years in practice.
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Published CMS data list 122 Medicare Part D prescriptions, including refills, in 2022.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2022. Published rows only; this is not a quality measure.
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Published Part D records, 2022:
- Lisinopril — 29 prescription fills, including refills.
- Metformin Hcl — 23 prescription fills, including refills.
- Atorvastatin Calcium — 22 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2022. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 6 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 917 in 2018 to 122 in 2022.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2018–2022.
Practice Location & Contact Primary Location
915 N King St
Honolulu, HI 968174544
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
General Practice: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
231 standardized 30-day fills in 2022
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
$931 in 2022
The total cost of these prescriptions in 2022, 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 – by Provider and Drug, 2022.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
NPI first issued
2006
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, “Does your provider accept Medicare as full payment?”
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.
Compared with the same specialty in Honolulu and Hawaii
Billing and prescribing volume is not a quality rating.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Koff are from 2022.
29 active clinicians are listed under General Practice with a practice address in Honolulu, HI (171 in Hawaii).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Honolulu
13.8% of these 29 clinicians have the CMS telehealth indicator.
31% of these 29 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 decreased 87% from 917 in 2018 to 122 in 2022.
- 2018: 917
- 2019: 1,311
- 2020: 1,168
- 2021: 898
- 2022: 122
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30-day fills
30-day fills decreased 87% from 1,723 in 2018 to 231 in 2022.
- 2018: 1,723
- 2019: 2,555
- 2020: 2,468
- 2021: 1,967
- 2022: 231
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Part D drug cost
Part D drug cost decreased 98% from $43,019 in 2018 to $931 in 2022.
- 2018: $43,019
- 2019: $69,447
- 2020: $44,395
- 2021: $36,825
- 2022: $931
Sources: CMS Medicare Part D Prescribers (2022), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2022.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Lisinopril | Lisinopril | 29 | 1,560 | $141.12 | — |
| Metformin Hcl | Metformin Hcl | 23 | 1,290 | $128.92 | — |
| Atorvastatin Calcium | Atorvastatin Calcium | 22 | 1,680 | $197.50 | 14 |
| Hydrochlorothiazide | Hydrochlorothiazide | 21 | 1,336 | $112.12 | — |
| Simvastatin | Simvastatin | 15 | 570 | $75.51 | — |
| Fluticasone Propionate | Fluticasone Propionate | 12 | 480 | $276.06 | — |
Source: CMS Part D by Provider and Drug, 2022; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 208D00000X
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Doctor of Nursing Practice, APRNRX, Family Nurse Practitioner (Board Certified)
Nurse Practitioner - Family
Advanced Practice Registered Nurse
Nurse Practitioner - Family
Advanced Practice Registered Nurse
Family Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Nurse Practitioner (Certified)
Preventive Medicine - Public Health & General Preventive Medicine
Doctor of Osteopathic Medicine (D.O.)
Career & Practice History
NPI enumerated October 23, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other General Practices in Honolulu
- Dr. Keith Stephenson, MD
- Dr. James Barahal, MD
- Dr. Raymond Thompson, MD
- Dr. Rodrigo Bristol, MD
- Dr. Wooyoung Chung, MD
- Dr. Andrea Lombardi, DO
Mailing Address
915 N King St
Honolulu, HI 968174544
Phone: 8088481438