JOHN E FASSLER MD
NPI 1891798757
Internal Medicine - Nephrology in Rock Hill, SC
NPI Status: Active since May 24, 2005
Contact Information
1436 RIVERCHASE BLVD
ROCK HILL, SC
ZIP 29732
Phone: (803) 329-2636
Fax: (803) 329-2184
- Individual
- Male
- Years of Experience 35
- Internal Medicine
- Nephrology
- Accepts Insurance
- Accepts Medicare Approved Payment
- PECOS Enrolled
About JOHN FASSLER
This page provides the complete NPI Profile along with additional information for John Fassler, an internist established in Rock Hill, South Carolina with a medical specialization in Internal Medicine, focusing in nephrology and more than 35 years of experience. He graduated from Ohio State University College Of Medicine in 1991. The healthcare provider is registered in the NPI registry with number 1891798757 assigned on May 2005. The practitioner's primary taxonomy code is 207RN0300X with license number 19767 (SC). The provider is registered as an individual and his NPI record was last updated February 2026.
- NPI
- 1891798757
- Provider Name
- JOHN E FASSLER MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1436 RIVERCHASE BLVD ROCK HILL, SC 29732
- Location Phone
- (803) 329-2636
- Location Fax
- (803) 329-2184
- Mailing Address
- 1436 RIVERCHASE BLVD ROCK HILL, SC 29732
- Mailing Phone
- (803) 329-2636
- Mailing Fax
- (803) 329-2184
- Medical School Name
- OHIO STATE UNIVERSITY COLLEGE OF MEDICINE
- Graduation Year
- 1991
- Is Sole Proprietor?
- No
- Enumeration Date
- 05-24-2005
- Last Update Date
- 02-05-2026
- Code Navigator
An internist like John Fassler is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
Location Map
Secondary Locations
- 322 S Main St
Lancaster, SC 29720
(803) 329-2636
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Internal Medicine Nephrology
- Taxonomy Code
- 207RN0300X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 19767
- License State
- SC
- Taxonomy Description
- An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
Insurance Plans Accepted
According to publicly available information the provider might be accepting the following health plans from these health insurance companies:
- Elite Bronze - HMO
- Elite Bronze + Vision + Adult Dental - HMO
- Everyday Bronze - HMO
- Everyday Bronze + Vision + Adult Dental - HMO
- Focused Silver - HMO
- Standard Expanded Bronze - HMO
- Standard Gold - HMO
- Standard Silver - HMO
- Standard Silver + Vision + Adult Dental - HMO
- Clear Silver with $0 Insulin Options - HMO
- Complete Gold - HMO
- Complete Gold + Vision + Adult Dental - HMO
- Complete Gold with Atrium Health - HMO
- Complete Gold with Atrium Health + Vision + Adult Dental - HMO
- Elite Bronze - HMO
- Elite Bronze + Vision + Adult Dental - HMO
- Elite Bronze with Atrium Health - HMO
- Elite Bronze with Atrium Health + Vision + Adult Dental - HMO
- Enhanced Asthma/COPD Care Silver with $0 Drug Options - HMO
- Blue Direction Bronze 1 - POS
- Blue Direction Silver 1 - POS
- Blue Direction Silver 1 + Adult Vision - POS
- Blue Direction Silver 2 - POS
- Blue Direction Standard Expanded Bronze - POS
- Blue Direction Standard Gold - POS
- Blue Direction Standard Silver - POS
- Blue VirtuConnect Bronze 1 - EPO
- Blue VirtuConnect Gold 1 - EPO
- Blue VirtuConnect Silver 1 - EPO
- First Choice Next Bronze Essential - HMO
- First Choice Next Bronze Premier - HMO
- First Choice Next Bronze Signature - HMO
- First Choice Next Gold Premier - HMO
- First Choice Next Gold Signature - HMO
- First Choice Next Silver Essential - HMO
- First Choice Next Silver Premier - HMO
- First Choice Next Silver Signature - HMO
- InHealth Basic 1 - HMO
- InHealth Basic 1 + Adult Vision - HMO
- InHealth Basic 2 - HMO
- InHealth Basic Plus Standard - HMO
- InHealth Basic Standard - HMO
- Molina Gold Core 1640 - HMO
- Molina Gold Core 1640 Plus with Adult Dental and Vision - HMO
- Molina Gold Core 1640 Plus with Adult Vision - HMO
- Molina Gold Standard - HMO
- Molina Gold Value - HMO
- Molina Gold Value Plus with Adult Dental and Vision - HMO
- Molina Gold Value Plus with Adult Vision - HMO
- Molina Silver Core - HMO
- Molina Silver Core Plus with Adult Dental and Vision - HMO
- Molina Silver Core Plus with Adult Vision - HMO
- UHC Bronze Copay Focus $0 Indiv Med Ded - HMO
- UHC Bronze Copay Focus+ $0 Indiv Med Ded (Dental + Vision) - HMO
- UHC Bronze Essential - HMO
- UHC Bronze Essential- - HMO
- UHC Bronze Standard - HMO
- UHC Bronze Standard Plus Chiro - HMO
- UHC Gold Advantage - HMO
- UHC Gold Advantage+ (Dental + Vision) - HMO
- UHC Gold Copay Focus $0 Indiv Med Ded - HMO
- UHC Gold Standard - HMO
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.
*Please verify directly with this provider to make sure your insurance plan is currently accepted.
Additional Identifiers
The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.
| Identifier | Type / Code | Identifier State | Identifier Issuer |
|---|---|---|---|
| T38527 | MEDICAID (05) | SC |
Medicare Participation & PECOS Enrollment Status
John Fassler is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.
John Fassler is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
PECOS PAC ID: 3870693930
What is the PECOS Associate Control ID?
A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.PECOS Enrollment ID: I20100215000394, I20120604000040
What is the Provider Enrollment ID?
The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.Accepts Medicare Assignment? Yes
What does it mean "accepts medicare assignment"?
When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
Provider Referred Orders for Durable Medical Equipment, Devices & Supplies
The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.
Unknown
Treatment-Treatment - Miscellaneous (RX029N)
Tacrolimus, immediate release, oral, 1 mg (HCPCS:J7507)
6 DME suppliers used 53 Medicare Claims 3600 Services Paid
Treatment-Treatment - Miscellaneous (RX029N)
Mycophenolate mofetil, oral, 250 mg (HCPCS:J7517)
4 DME suppliers used 34 Medicare Claims 3540 Services Paid
Treatment-Treatment - Miscellaneous (RX029N)
Mycophenolic acid, oral, 180 mg (HCPCS:J7518)
3 DME suppliers used 20 Medicare Claims 2790 Services Paid
Treatment-Chemotherapy (RH012N)
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period (HCPCS:Q0511)
4 DME suppliers used 39 Medicare Claims 39 Services Paid
Treatment-Chemotherapy (RH012N)
Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period (HCPCS:Q0512)
6 DME suppliers used 63 Medicare Claims 80 Services Paid
Areas of Expertise
The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.
Dialysis services, 2-3 physician visits per month (20 years or older)
Dialysis services, 4 or more physician visits per month (20 years or older)
Established patient office or other outpatient visit, 20-29 minutes
Established patient office or other outpatient visit, 30-39 minutes
Follow-up hospital inpatient care per day, typically 25 minutes
Hemodialysis procedure with physician evaluation
Home dialysis services per month (20 years or older)
Initial hospital inpatient care per day, typically 50 minutes
Injection of drug or substance under skin or into muscle
Injection, epoetin alfa, (for non-esrd use), 1000 units
Management using the results of remote vital sign monitoring per calendar month, first 20 minutes
Manual urinalysis test with examination using microscope, non-automated
New patient office or other outpatient visit, 30-44 minutes
New patient office or other outpatient visit, 45-59 minutes
Remote monitoring of physiologic parameters, initial set-up and patient education on use of equipment
Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days
Dialysis is a treatment that performs the function of healthy kidneys if they're not working properly. It removes waste and excess fluid from your blood. 2-3 physician visits per month are recommended for monitoring your health and adjusting your treatment as needed. This service is available for those aged 20 years and older.
This service was performed 21 times for 16 patientsDialysis is a treatment that filters and purifies your blood using a machine. It helps keep your fluids and electrolytes in balance when the kidneys can't do their job. This service includes 4 or more visits per month with a physician to monitor your health and adjust your treatment as needed.
This service was performed 292 times for 76 patientsThis is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
This service was performed 291 times for 235 patientsThis is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
This service was performed 429 times for 291 patientsFollow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
This service was performed 83 times for 49 patientsHemodialysis is a treatment that uses a machine to filter waste and excess fluid from your blood when your kidneys can't. A physician checks your health before, during, and after the procedure to ensure it's working effectively for you.
This service was performed 60 times for 39 patientsHome dialysis services provide kidney treatment for patients aged 20 or older right in their own homes. This service includes necessary equipment, supplies, and support for performing dialysis. It's a convenient option that allows patients to maintain their daily routines while receiving essential care.
This service was performed 37 times for 13 patientsInitial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
This service was performed 41 times for 41 patientsThis procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.
This service was performed 30 times for 20 patientsEpoetin alfa is a medication injected to help your body produce more red blood cells, improving energy levels and reducing tiredness. It's often used for patients with certain types of anemia. Each injection contains 1000 units of the medicine.
This service was performed 990 times for 18 patientsThis service involves reviewing and managing your health data, which is remotely monitored and collected. Your vital signs like heart rate and blood pressure are tracked regularly throughout the month. The first 20 minutes of this data analysis per month is included in this service.
This service was performed 173 times for 24 patientsA manual urinalysis test involves studying a urine sample under a microscope. This non-automated method helps identify any abnormal substances present. It's a useful tool for detecting potential health concerns early. The process is simple and non-invasive.
This service was performed 53 times for 51 patientsThis service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
This service was performed 27 times for 27 patientsThis is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
This service was performed 28 times for 28 patientsRemote monitoring of physiologic parameters involves using special equipment to track vital signs like heart rate and blood pressure from a distance. The initial set-up includes installing the device and teaching the patient how to use it correctly for accurate readings.
This service was performed 19 times for 19 patientsThis service involves using devices to remotely track body functions like heart rate or blood pressure. These devices, provided initially, record data daily or send alerts if readings are abnormal. The service is renewed every 30 days.
This service was performed 153 times for 23 patientsPhysician Visit Costs
The typical physician office visit costs for Medicare beneficiaries in this area are: $31.01 for a new patient copayment and $23.78 for an established patient copayment.
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 29732 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $124.04
- Minimum New Patient Price $53.57
- Maximum New Patient Price $163.84
- Average New Patient Copayment $31.01
- Minimum New Patient Copayment $13.39
- Maximum New Patient Copayment $40.96
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $95.12
- Minimum Established Patient Price $16.96
- Maximum Established Patient Price $133.52
- Average Established Patient Copayment $23.78
- Minimum Established Patient Copayment $4.24
- Maximum Established Patient Copayment $33.38
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
Find Provider Hospital Affiliations - Privileges
Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.
Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. John Fassler is affiliated with the following medical facilities:
| Hospital Name | Address | Phone | Hospital Type | Overall Rating |
|---|---|---|---|---|
| PIEDMONT MEDICAL CENTER | 1731 FRANK GASTON BLVD ROCK HILL, SC 29732 | (803) 329-1234 | Acute Care Hospitals |
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NPI NPI Number Validation
How NPI Validation Works
The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.
To verify the NPI 1891798757, we treat the final digit (7) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 73. The final step is to find the difference between that total and the next multiple of ten (80 - 73 = 7).
Digit-by-digit view
Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.
Step 1: Double every other digit from the right
Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 73 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 15 providers are registered at the same or a nearby location.
ROCK HILL, SC 29732
ROCK HILL, SC 29732
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1891798757, enumerated as an "individual" on May 24, 2005.
The provider is located at 1436 RIVERCHASE BLVD ROCK HILL, SC 29732 and the phone number is (803) 329-2636.
Internal Medicine with taxonomy code 207RN0300X and a focus in Nephrology.
The provider might be accepting Accepts: Ambetter from Absolute Total Care, Ambetter of. Please consult your insurance carrier or call the provider to verify.
John Fassler is affiliated with: PIEDMONT MEDICAL CENTER.