Physician Profile
Unclaimed ProfileAbout DUFF
Based in Louisville, KY, Don Ryan Duff, MD is listed in the NPI registry under internal medicine. Don graduated from University of Louisville School of Medicine in 1986. Don is also listed as specializing in nephrology. According to Medicare claims data, Don cared for 1,558 Medicare patients across 2,697 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Duff's specialty?
Dr. Duff is an internal medicine in Louisville, KY. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “INTERNAL MEDICINE”.
NPI registry
Where can I find Dr. Duff?
Dr. Duff is listed at 3999 DUTCHMANS LN STE 4A, Louisville, KY 40207. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Duff?
The number on file is (502) 365-2655. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Duff's NPI number?
Dr. Duff's National Provider Identifier is 1154325900. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Duff's medical education?
Dr. Duff attended University of Louisville School of Medicine, graduating in 1986. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Duff been practicing?
Dr. Duff has 40 years experience. Calculated from a graduation year of 1986, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Duff known for?
According to Medicare billing data, Dr. Duff provides treatments such as dialysis services, 2-3 physician visits per month and dialysis services, 4 or more physician visits per month, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Duff confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Duff. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (502) 365-2655
- Email not available
Practice Locations
3999 DUTCHMANS LN STE 4A
Louisville, KY 40207
Procedures Most Often Billed to Medicare
2,697 services · 1,558 patients · 13 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Dialysis services, 2-3 physician visits per month (20 years or older) | Treatment | 90961 |
121 |
| Dialysis services, 4 or more physician visits per month (20 years or older) | Treatment | 90960 |
104 |
| Dialysis services, 1 physician visit per month (20 years or older) | Treatment | 90962 |
90 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
763 |
| Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient' | Billing code | G2211 |
470 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
430 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
189 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
149 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
128 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
110 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other internal medicines in Louisville 8
Same specialty, same city.
More connections — 22 related providers in 3 groups
Trained at University of Louisville School of Medicine 6
Other providers in the same specialty who trained at the same institution.
Class of 1986 at University of Louisville School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Dialysis services, 2-3 physician visits per month (20 years or older) 8
Providers in KY who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.