DR. ADAM ZACHARY TILLOWITZ MD
NPI 1245869510
Internal Medicine - Gastroenterology in Washington, DC
NPI Status: Active since April 07, 2020
Contact Information
THE GW MEDICAL FACULTY ASSOCIATES
2150 PENNSYLVANIA AVE
WASHINGTON, DC
ZIP 20037
Phone: (202) 741-3000
- Individual
- Male
- Internal Medicine
- Gastroenterology
- PECOS Enrolled
About ADAM TILLOWITZ
This page provides the complete NPI Profile along with additional information for Adam Tillowitz, an internist established in Washington, District Of Columbia with a medical specialization in Internal Medicine, focusing in gastroenterology . The healthcare provider is registered in the NPI registry with number 1245869510 assigned on April 2020. The practitioner's primary taxonomy code is 207RG0100X with license number MD21210 (RI). The provider is registered as an individual and his NPI record was last updated May 2026.
- NPI
- 1245869510
- Provider Name
- DR. ADAM ZACHARY TILLOWITZ MD
- Other Name
- ADAM ZACHARY HOROWITZ
- Other Name Type
- Former Name (1)
- Gender
- Male
- Entity Type
- Individual
- Location Address
- THE GW MEDICAL FACULTY ASSOCIATES 2150 PENNSYLVANIA AVE WASHINGTON, DC 20037
- Location Phone
- (202) 741-3000
- Mailing Address
- PO BOX 202230 DALLAS, TX 75320
- Mailing Phone
- (401) 421-8800
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 04-07-2020
- Last Update Date
- 05-18-2026
- Code Navigator
An internist like Adam Tillowitz 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
- 44 W River St
Providence, RI 02904
(401) 274-4800
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 Gastroenterology
- Taxonomy Code
- 207RG0100X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- MD21210
- License State
- RI
- Taxonomy Description
- An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Medicare Participation & PECOS Enrollment Status
Adam Tillowitz 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
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
Physician Visit Costs
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 20037 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is 99204
- Average New Patient Price $147.85
- Minimum New Patient Price $65.18
- Maximum New Patient Price $194.86
- Average New Patient Copayment $36.96
- Minimum New Patient Copayment $16.29
- Maximum New Patient Copayment $48.71
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99214
- Average Established Patient Price $113.72
- Minimum Established Patient Price $21.4
- Maximum Established Patient Price $158.88
- Average Established Patient Copayment $28.43
- Minimum Established Patient Copayment $5.35
- Maximum Established Patient Copayment $39.72
* 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.
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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 1245869510, we treat the final digit (0) 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 70. The final step is to find the difference between that total and the next multiple of ten (70 - 70 = 0).
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 70 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 16 providers are registered at the same or a nearby location.
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
WASHINGTON, DC 20037
DC, DC 20037
WASHINGTON, DC 20037
WASHINGTON DC, DC 20037
WASHINGTON, DC 20037
WASHINGTON DC, DC 20037
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1245869510, enumerated as an "individual" on April 07, 2020.
The provider is located at THE GW MEDICAL FACULTY ASSOCIATES 2150 PENNSYLVANIA AVE WASHINGTON, DC 20037 and the phone number is (202) 741-3000.
Internal Medicine with taxonomy code 207RG0100X and a focus in Gastroenterology.
