Isaac Lill
Internal Medicine β’ Waco, TX
100 Hillcrest Medical Blvd
Waco, TX 767128897
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
100 Hillcrest Medical Blvd
Waco, TX 767128897
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Houston, TX. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Hillcrest Physician Services. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
University Of Texas Southwestern Medical School At Dallas
2022
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019β2025.
Years since graduation
4 years (graduated 2022)
CMS Doctors and Clinicians data list 2022 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished 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, CMS release of October 2, 2026.
NPI first issued
2022
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.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
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, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Isaac Lill 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.
Can order Medicare-covered services
CMS lists Isaac Lill 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.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
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.
Compared with the same specialty in Waco and Texas
42 active clinicians are listed under Internal Medicine with a practice address in Waco, TX (9,244 in Texas).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Waco
7.1% of these 42 clinicians have the CMS telehealth indicator.
69% of these 42 clinicians are listed by CMS as accepting Medicare assignment.
Sources: CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2025-10-01NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20250916002904
TX
0042714891
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, CMS release of October 2, 2026
Hillcrest Physician Services
100 Hillcrest Med Blvde, Waco, TX 767128897
Phone: 2542022000
Hillcrest Physician Services
140 Hillcrest Medical Blvd, Waco, TX 767128897
Hillcrest Physician Services
150 Hillcrest Medical Blvd, Waco, TX 767128897
Phone: 2542024000
Hillcrest Physician Services
50 Hillcrest Medical Blvd, Waco, TX 767128954
Phone: 2542027950
Hillcrest Physician Services
50 Hillcrest Medical Blvd, Waco, TX 767128955
Secondary Practice Locations
1 Baylor Plz
Houston, TX 770303498
Phone: 7137984951
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Anesthesiologist Assistant
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Anesthetist, Certified Registered
Family Medicine - Hospice and Palliative Medicine
Doctor of Medicine (M.D.)
Hospitalist
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Additional practice office at 1 Baylor Plz, Houston, TX 770303498
Internal Medicine (license number reported to NPPES: TX V6348)
Registered at 100 HILLCREST MEDICAL BLVD, WACO, TX 767128897 (Tel: 2542022000)
Registered at PO BOX 848491, DALLAS, TX 752848491 (Tel: 2542029330)
NPI status registered as active in NPPES database
Registered at 1 BAYLOR PLZ, HOUSTON, TX 770303498 (Tel: 7137984951)
Registered at 6401 MAPLE AVE APT 8102, DALLAS, TX 752355525 (Tel: 5127400124)
Recorded as ISAAC LILL
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Waco
- Dr. Imran Ali-Bandesha, MD
- Dr. Ross Shipp, MD
- Dr. Justin Remsing, MD
- Dr. Benjamin Wilson, MD
- Dr. Stuart Hepworth, DO
- Dr. Deo Mulindwa, MD
Mailing Address
Po Box 848491
Dallas, TX 752848491
Phone: 2542029330