Physician Profile
Mark T. Fahlen, MD
Unclaimed ProfileAbout Dr. Fahlen
Mark T. Fahlen, MD practices nephrology in Modesto, CA. Mark is a 1998 graduate of Albany Medical College of Union University. Mark is also listed as specializing in internal medicine. Medicare claims data shows Mark provided 2,171 services to 669 patients. The services billed most often include dialysis services, 1 physician visit per month (20 years or older), established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and hemodialysis procedure with physician evaluation.
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
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (209) 544-2910
- Email not available
Practice Locations
1400 FLORIDA AVE SUITE 109
Modesto, CA 95350
Conditions Commonly Evaluated or Treated
Within Nephrology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Chronic kidney disease
- High blood pressure
- Kidney failure
- Kidney stones
Acid-base disorders
- Acid in blood
Anatomical conditions
- Shrinking kidneys
- Single kidney health
Autoimmune conditions
- IgA kidney disease
- Lupus kidney disease
Blood disorders
- Anemia from kidney disease
Blood pressure
- Resistant hypertension
Cysts and growths
- Kidney Cyst
Diabetes complications
- Kidney disease from diabetes
Dialysis complications
- Dialysis Low Blood Pressure
Electrolyte disorders
- High calcium
- High Magnesium
- High phosphorus
- Low Magnesium
- Low sodium or electrolyte imbalance
Fluid retention
- Excess fluid buildup
- Poor Circulation and Swollen Legs
Genetic disorders
- Inherited kidney disease
- Polycystic kidney disease
Hormone disorders
- Overactive parathyroid from kidney disease
Infections
- Kidney infection
Inflammatory conditions
- FSGS
- Membranous kidney disease
- Minimal change disease
Kidney damage
- Kidney damage from medications
- Kidney Scarring
Kidney failure
- Acute kidney injury
Kidney filter diseases
- C3 Glomerulopathy
Lab abnormalities
- High BUN levels
- High creatinine levels
- Low filtration rate
Metabolic disorders
- Gout
Multi-organ conditions
- Heart And Kidney Failure
Structural kidney issues
- Hydronephrosis
- Vesicoureteral reflux
Symptoms
- Flank pain
Urine abnormalities
- Blood in the urine
- Kidney Disease
Urine symptoms
- Foamy Urine
- Waking Up to Pee
Vascular conditions
- Narrow kidney artery
Vascular kidney issues
- Kidney Blood Clot
Procedures & services
Most searched procedures
- Dialysis
- Kidney transplant follow-up
Consultations
- Kidney Medication Safety Review
- Kidney specialist second opinion
Diagnostic tests
- Ambulatory blood-pressure monitoring
Diagnostics
- Genetic testing for kidney disease
- Kidney biopsy
Dialysis
- Continuous Dialysis in the ICU
- Overnight Dialysis
- Peritoneal Dialysis
Dialysis access
- Dialysis Access Physical Exam
- Dialysis Catheter Removal
- Dialysis Fistula Repair
- Temporary Dialysis Line Placement
Diet and nutrition
- Kidney Disease Diet Planning
Imaging
- Blood flow test for kidneys
- Fistula ultrasound
- Kidney CT Scan
- Kidney MRI
- Kidney ultrasound
Infusions
- Immune therapy for kidney inflammation
- Iron Infusion
Interventional procedures
- Kidney cyst drainage
- Renal artery stenting
Lab tests
- 24-hour urine test
- Comprehensive Metabolic Panel
- Kidney Function Blood Test
- Parathyroid hormone monitoring
- Urine protein check
- Urine sediment test
Medication management
- Active Vitamin D Therapy
- Resistant Blood Pressure Medication Adjustment
- Steroid Therapy For Kidney Inflammation
Medication therapy
- Acid reducer treatment for kidneys
- Phosphate binder therapy
- Potassium lowering treatment
- Red blood cell booster injections
- Water pill adjustment
Patient education
- Home dialysis training
Prevention
- Kidney Stone Prevention Evaluation
Procedures
- High Blood Pressure Nerve Treatment
Specialized therapies
- Extracorporeal fluid removal
- Plasmapheresis
Supportive care
- Supportive Kidney Care Without Dialysis
Surgical procedures
- Dialysis access surgery
Transplant care
- Anti-Rejection Medication Monitoring
- Kidney transplant evaluation
- Living kidney donor evaluation
Vascular access
- Belly catheter placement
- Dialysis catheter placement
- Dialysis fistula declotting
Procedures Most Often Billed to Medicare
2,171 services · 669 patients · 8 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Dialysis services, 1 physician visit per month (20 years or older) | Treatment | 90962 |
772 | More than most peers in Nephrology |
| Hemodialysis procedure with physician evaluation | Treatment | 90935 |
362 | More than most peers in Nephrology |
| Dialysis services, 2-3 physician visits per month (20 years or older) | Treatment | 90961 |
72 | More often than most peers in Nephrology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
487 | More often than most peers in Nephrology |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
334 | More often than most peers in Nephrology |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
76 | As often as other peers in Nephrology |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
38 | More often than most peers in Nephrology |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
30 | Less often than most peers in Nephrology |
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.
Related specialists at this location 3
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 kidney specialists in Modesto 8
Same specialty, same city.
More connections — 21 related providers in 3 groups
Trained at Albany Medical College of Union University 8
Other providers in the same specialty who trained at the same institution.
Class of 1998 at Albany Medical College of Union University 7
Providers who graduated from the same medical school in the same year.
Also performs Dialysis services, 1 physician visit per month (20 years or older) 6
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. Fahlen?
Dr. Fahlen is a kidney specialist in Modesto, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Nephrology”.
NPI registry
What is Dr. Fahlen's address?
Dr. Fahlen is listed at 1400 Florida Ave Suite 109, Modesto, CA 95350. 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. Fahlen?
The number on file is (209) 544-2910. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Fahlen?
Dr. Fahlen's National Provider Identifier is 1679539415. 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. Fahlen train?
Dr. Fahlen attended Albany Medical College of Union University, graduating in 1998. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Fahlen have?
Dr. Fahlen has 28 years experience. Calculated from a graduation year of 1998, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Fahlen perform?
According to Medicare billing data, Dr. Fahlen provides treatments such as dialysis services, 1 physician visit per month and hemodialysis procedure with physician evaluation, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Fahlen's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Fahlen. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.