Physician Profile
Unclaimed ProfileAbout ISOM
Based in Portland, ME, Robert Tristian Isom, M.D. is listed in the NPI registry under nephrology. Robert graduated from Columbia University College of Physicians and Surgeons in 1997.
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 kind of doctor is Dr. Isom?
Dr. Isom is a nephrology in Portland, ME. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “NEPHROLOGY”.
NPI registry
What is Dr. Isom's address?
Dr. Isom is listed at 1600 CONGRESS ST STE B, Portland, ME 04102. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Isom?
The number on file is (207) 774-5222. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Isom's NPI number?
Dr. Isom's National Provider Identifier is 1356428072. 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
Where did Dr. Isom train?
Dr. Isom attended Columbia University College of Physicians and Surgeons, graduating in 1997. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Isom been practising?
Dr. Isom has 29 years experience. Calculated from a graduation year of 1997, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Isom perform?
According to Medicare billing data, Dr. Isom performs procedures including insertion of needle into vein for collection of blood sample; reads or performs imaging such as complete ultrasound scan behind abdominal cavity; provides treatments such as injection of drug or substance under skin or into muscle 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. Isom confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Isom. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (207) 774-5222
- Email not available
Practice Locations
1600 CONGRESS ST STE B
Portland, ME 04102
Procedures Most Often Billed to Medicare
3,887 services · 1,026 patients · 18 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
128 |
| Complete ultrasound scan behind abdominal cavity | Imaging | 76770 |
63 |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
148 |
| Dialysis services, 4 or more physician visits per month (20 years or older) | Treatment | 90960 |
50 |
| Influenza vaccine split virus, preservative free | Treatment | 90662 |
32 |
| Injection, epoetin alfa, (for non-esrd use), 1000 units | Drug given | J0885 |
2,290 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
491 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
245 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
122 |
| Kidney function blood test panel | Lab test | 80069 |
70 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other nephrology specialists at this location 8
Same specialty, same street address — most likely the same department or group.
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 nephrology specialists in Portland 6
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Columbia University College of Physicians and Surgeons 8
Other providers in the same specialty who trained at the same institution.
Class of 1997 at Columbia University College of Physicians and Surgeons 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in ME 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.