Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

Dr. William John Dahms , DO

Internal Medicine - Nephrology โ€ข Newark, DE

Active NPI 1952419376 Individual Practitioner Male Practitioner Accepts Medicare assignment Telehealth (some services)
Practice location in NPPES

4923 Ogletown Stanton Rd, Suite 200
Newark, DE 197132081

Call 3022250451 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

4923 Ogletown Stanton Rd
Suite 200

Newark, DE 197132081

Telephone 3022250451
Fax 3022250472
Organization at the Same NPPES Address or Phone
Mid-Atlantic Endoscopy Center, Llc Facility NPI 1497751747

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 1 group name: Nephrology Associates Pa. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Medical School

Philadelphia College Of Osteopathic Medicine

Graduation Year

2000

Medicare patients

691 people with Original Medicare in 2024

Different Original Medicare patients in 2024; counts below 11 are hidden; this does not show availability or quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider, 2024.

Medicare-allowed amount

About $320,315 in 2024

The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.

What this does not show: Medicare-allowed amount

This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

Paid by Medicare

About $249,891 in 2024

The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.

What this does not show: Paid by Medicare

This is not the clinician's income and not a measure of quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

30-day fills

3,155 standardized 30-day fills in 2024

CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.

What this does not show: 30-day fills

It is not a count of patients and not a measure of quality.

Part D drug cost

$300,926 in 2024

The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.

What this does not show: Part D drug cost

A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.

Source: CMS, Medicare Part D Prescribers โ€“ by Provider and Drug, 2024.

Open Payments general payments, program year 2025

All general payments: $2,656.14 across 109 records.

By nature of payment

  • Food and Beverage: $2,618.60 across 107 records.
  • Education: $37.54 across 2 records.

Reporting-company totals (3 largest of 24)

  • Ardelyx, Inc.: $277.92 across 11 records.
  • Amgen Inc.: $269.13 across 14 records.
  • Calliditas Therapeutics US Inc.: $262.29 across 9 records.

A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.

See the full table

Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).

Guide: How to read an Open Payments record

Years since graduation

26 years (graduated 2000)

CMS Doctors and Clinicians data list 2000 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2006

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, โ€œDoes your provider accept Medicare as full payment?โ€

Guide: What Medicare assignment means

Telehealth (some services)

Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.

What this does not show: Telehealth (some services)

It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Dr. Dahms has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Dr. Dahms as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Newark and Delaware

Billing and prescribing volume is not a quality rating.

Medicare Part B services

More Medicare Part B services than 80% of clinicians listed under Internal Medicine - Nephrology in Newark, DE (2024, 17 clinicians with data). Median for this group: 3,672. Middle half: 1,322 to 3,999.

More Medicare Part B services than 75% of clinicians listed under Internal Medicine - Nephrology in Delaware (2024, 38 clinicians with data). Median for this group: 2,846. Middle half: 1,371 to 3,981.

Medicare-allowed amount

A higher Medicare-allowed amount than 75% of clinicians listed under Internal Medicine - Nephrology in Newark, DE (2024, 17 clinicians with data). Median for this group: $233,255. Middle half: $151,849 to $320,315.

A higher Medicare-allowed amount than 75% of clinicians listed under Internal Medicine - Nephrology in Delaware (2024, 38 clinicians with data). Median for this group: $225,307. Middle half: $168,394 to $316,063.

Paid by Medicare

A higher Medicare payment amount than 75% of clinicians listed under Internal Medicine - Nephrology in Newark, DE (2024, 17 clinicians with data). Median for this group: $180,676. Middle half: $116,220 to $249,891.

A higher Medicare payment amount than 75% of clinicians listed under Internal Medicine - Nephrology in Delaware (2024, 38 clinicians with data). Median for this group: $175,600. Middle half: $132,145 to $245,684.

Medicare Part D prescriptions

More Part D prescriptions than 75% of clinicians listed under Internal Medicine - Nephrology in Newark, DE (2024, 17 clinicians with data). Median for this group: 819. Middle half: 428 to 1,158.

More Part D prescriptions than 75% of clinicians listed under Internal Medicine - Nephrology in Delaware (2024, 40 clinicians with data). Median for this group: 836. Middle half: 471 to 1,139.

Part D drug cost

A higher Part D drug cost than 80% of clinicians listed under Internal Medicine - Nephrology in Newark, DE (2024, 17 clinicians with data). Median for this group: $80,962. Middle half: $53,704 to $266,466.

A higher Part D drug cost than 70% of clinicians listed under Internal Medicine - Nephrology in Delaware (2024, 40 clinicians with data). Median for this group: $141,395. Middle half: $43,047 to $305,235.

22 active clinicians are listed under Internal Medicine - Nephrology with a practice address in Newark, DE (52 in Delaware).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Newark

63.6% of these 22 clinicians have the CMS telehealth indicator.

77.3% of these 22 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo ยท Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments ยท Program Year 2025
Disclosure Year:

Program year 2025 (payments made January 1 โ€“ December 31, 2025): 109 records totaling $2,656.14.

Manufacturer Payment Nature Product Type Amount ($)
Eli Lilly and Company
Food and Beverage
Cash or cash equivalent
ZEPBOUND General $121.25
Vifor Pharma, Inc.
Food and Beverage
In-kind items and services
Veltassa General $101.52
Ardelyx, Inc.
Food and Beverage
In-kind items and services
XPHOZAH 30 MG General $86.50
Calliditas Therapeutics US Inc.
Food and Beverage
In-kind items and services
TARPEYO General $74.41
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $38.20
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $35.85
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $35.44
Calliditas Therapeutics US Inc.
Food and Beverage
In-kind items and services
TARPEYO General $34.40
Otsuka Pharmaceutical Development & Commercialization, Inc.
Food and Beverage
In-kind items and services
โ€” General $33.23
Novartis Pharmaceuticals Corporation
Food and Beverage
In-kind items and services
Vanrafia General $33.20
Otsuka America Pharmaceutical, Inc.
Food and Beverage
In-kind items and services
VOYXACT General $32.76
Calliditas Therapeutics US Inc.
Food and Beverage
In-kind items and services
TARPEYO General $32.22
AstraZeneca Pharmaceuticals LP
Food and Beverage
In-kind items and services
FARXIGA General $31.89
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $30.09
Fresenius USA Marketing, Inc.
Food and Beverage
In-kind items and services
VELPHORO General $29.03
ANI Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
PURIFIED CORTROPHIN GEL General $28.90
Novartis Pharmaceuticals Corporation
Food and Beverage
In-kind items and services
Fabhalta General $28.67
Fresenius USA Marketing, Inc.
Food and Beverage
In-kind items and services
VELPHORO General $28.32
ANI Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
PURIFIED CORTROPHIN GEL General $28.29
ANI Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
PURIFIED CORTROPHIN GEL General $27.89
Ardelyx, Inc.
Food and Beverage
In-kind items and services
IBSRELA General $27.88
Aurinia Pharma U.S., Inc.
Food and Beverage
In-kind items and services
LUPKYNIS General $27.83
Aurinia Pharma U.S., Inc.
Food and Beverage
In-kind items and services
LUPKYNIS General $27.81
AKEBIA THERAPEUTICS INC
Food and Beverage
In-kind items and services
Vafseo General $27.37
Fresenius USA Marketing, Inc.
Food and Beverage
In-kind items and services
VELPHORO General $27.12

(top 25 shown)

Source: CMS Open Payments, program year 2025, released June 30, 2026.

Performed Procedures & Service Volume

Services billed to Original Medicare Part B in 2024.

CMS Part B ยท Data Year 2024
Reporting Year:

CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ€“2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ€“ by Provider and Service data, 2017โ€“2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

HCPCS Code Services Patients Submitted Charge Medicare Allowed
Q5106 Injection, epoetin alfa-epbx, biosimilar, (retacrit) (for non-esrd use), 1000 units
900 35 $10.00 $7.34
Q9967 Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml
875 26 $0.25 $0.13
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
527 198 $126.94 $115.24
G2211 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's
366 247 $20.00 $16.01
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
340 232 $170.00 $104.21
90960 Dialysis services, 4 or more physician visits per month (20 years or older)
291 40 $660.00 $342.92
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
271 117 $92.44 $76.43
90935 Hemodialysis procedure with physician evaluation
144 84 $325.00 $68.54
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
117 111 $260.00 $168.35
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
73 48 $235.00 $114.50
96372 Injection of drug or substance under skin or into muscle
52 35 $30.00 $14.00
90966 Home dialysis services per month (20 years or older)
49 11 $660.00 $285.14
77001 Fluoroscopic guidance for insertion or removal of central vein access device
42 38 $35.00 $17.31
36558 Insertion of tunneled central venous tube for infusion (5 years or older)
40 36 $750.00 $236.13
76937 Ultrasonic guidance for blood vessel access
37 34 $30.00 $13.39
90961 Dialysis services, 2-3 physician visits per month (20 years or older)
28 14 $604.00 $284.60
99291 Critical care, first 30-74 minutes
17 13 $380.00 $206.75
36902 Insertion of needle and/or tube into hemodialysis circuit and balloon dilation of dialysis segment with review by radiologist
12 11 $1900.00 $1151.43
99153 Use of a drug to induce depression of consciousness by physician performing a procedure, each additional 15 minutes
12 11 $20.00 $11.33
99152 Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes
11 11 $80.00 $49.09
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
11 11 $225.00 $163.73

Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits

Submitted charges are billed amounts, not a price quote for your visit.

Medicare Part D Prescribing Profile & Medications

Medicare Part D prescriptions filled, including refills, in 2024.

CMS Part D ยท Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Torsemide Torsemide 248 20,936 $4,040.55 77
Losartan Potassium Losartan Potassium 153 13,382 $1,764.24 48
Allopurinol Allopurinol 89 7,969 $985.65 28
Amlodipine Besylate Amlodipine Besylate 61 5,490 $524.15 21
Spironolactone Spironolactone 56 4,920 $843.85 20
Chlorthalidone Chlorthalidone 46 4,140 $782.49 14
Eplerenone Eplerenone 42 2,453 $3,421.50 11
Furosemide Furosemide 40 3,123 $274.29 12
Hydralazine Hcl Hydralazine Hcl 32 2,920 $341.34 12
Potassium Citrate Er Potassium Citrate 32 2,700 $2,371.82 13
Carvedilol Carvedilol 29 2,650 $217.30 โ€”
Lisinopril Lisinopril 28 2,520 $251.97 โ€”
Tamsulosin Hcl Tamsulosin Hcl 28 2,280 $406.02 11
Hydrochlorothiazide Hydrochlorothiazide 25 1,830 $66.53 โ€”
Metoprolol Succinate Metoprolol Succinate 24 2,160 $545.49 โ€”
Vitamin D2 Ergocalciferol (Vitamin D2) 22 1,376 $306.14 โ€”
Losartan-Hydrochlorothiazide Losartan/Hydrochlorothiazide 19 1,650 $222.36 โ€”
Metoprolol Tartrate Metoprolol Tartrate 17 1,530 $158.69 โ€”
Atorvastatin Calcium Atorvastatin Calcium 17 1,463 $470.75 โ€”
Mirtazapine Mirtazapine 17 510 $162.03 โ€”
Jardiance Empagliflozin 17 1,350 $26,312.42 โ€”
Kerendia Finerenone 16 1,200 $24,109.49 โ€”
Bumetanide Bumetanide 14 1,200 $105.42 โ€”
Sevelamer Carbonate Sevelamer Carbonate 14 540 $2,024.78 โ€”
Lokelma Sodium Zirconium Cyclosilicate 14 540 $14,240.14 โ€”

(top 25 shown)

Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2021-06-17
Internal Medicine - Nephrology Primary Specialty

NUCC Taxonomy Code: 207RN0300X

License # reported to NPPES DE C2-0008640

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.

Internal Medicine - Nephrology

NUCC Taxonomy Code: 207RN0300X

License # reported to NPPES MD H0067091

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.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Delaware State Medical Licensing Board.
Look Up on State Board Site

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid ID
0175501 (NJ)
Medicaid ID
1952419376 (DE)
Medicaid ID
415810500 (MD)

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - NEPHROLOGY

Medicare Enrollment ID

I20080822000054

Enrollment State Jurisdiction

DE

PECOS Control ID

4981606274

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Nephrology Associates Pa

137 W High St, Elkton, MD 219218614

Phone: 4106209200

Nephrology Associates Pa

4923 Ogletown Stanton Rd, Newark, DE 197132081

Phone: 3022250451

Nephrology Associates Pa

701 N Clayton St, Wilmington, DE 198053165

Phone: 3024219411

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

24 listed
Jittu Abraham , NP

Nurse Practitioner

NPI 1902569353

Nurse Practitioner

Dr. Feroz Abubacker Kaniyamparambil , MD

Internal Medicine - Nephrology

NPI 1710119045

Doctor of Medicine (M.D.)

Dr. Liann Abu Salman , MD

Internal Medicine - Nephrology

NPI 1982125860

Doctor of Medicine (M.D.)

Dr. Piyaporn Apivatanagul , MD

Internal Medicine - Nephrology

NPI 1477766707

Doctor of Medicine (M.D.)

Dr. Peter Burke , DO

Internal Medicine - Nephrology

NPI 1902126493

Doctor of Osteopathic Medicine (D.O.)

Dr. Farhana Chowdhury , MD

Internal Medicine - Nephrology

NPI 1710218235

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

7 Historical Events
๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) June 17, 2021

Internal Medicine (license number reported to NPPES: DE C2-0008640)

โœ…
NPI Profile Active June 15, 2011

NPI status registered as active in NPPES database

๐Ÿ“
Practice Location (Initial Record) June 15, 2011

Registered at 4923 OGLETOWN STANTON RD, SUITE 200, NEWARK, DE 197132081 (Tel: 3022250451)

๐Ÿ“
Business Mailing Address (Initial Record) June 15, 2011

Registered at 4923 OGLETOWN STANTON RD, SUITE 200, NEWARK, DE 197132081 (Tel: 3022250451)

๐Ÿ‘ค
Provider Name / Credentials (Initial Record) June 15, 2011

Recorded as WILLIAM DAHMS, D.O.

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) June 15, 2011

Internal Medicine (license number reported to NPPES: DE C2-0008640)

๐ŸŸข
Initial NPI Registration & Enumeration August 26, 2006

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1952419376
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: August 26, 2006
Last Update: June 17, 2021
Sole Proprietor: No

Other Internal Medicine - Nephrology Specialists in Newark

All Internal Medicine - Nephrology Specialists in Newark

Mailing Address

4923 Ogletown Stanton Rd, Suite 200

Newark, DE 197132081

Phone: 3022250451

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.