Active NPI 1104815075 Individual Practitioner Male Practitioner

Dr. Mark A Isaeff , MD

Internal Medicine • San Antonio, TX

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Mark Isaeff, MD is a certified Internal Medicine practicing in San Antonio, TX. With approximately 28 years of clinical experience since graduating from Georgetown University School Of Medicine in 1998, Dr. Isaeff delivers high-quality medical care to the local community at 1303 MCCULLOUGH AVE.

Dr. Isaeff accepts Medicare assignment.

Frequently performed procedures and clinical services include established patient outpatient office visit, telephone medical discussion with physician, routine ekg using at least 12 leads including interpretation and report. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1303 Mccullough Ave
Suite 542

San Antonio, TX 782125607

Telephone 2105724431

Fax 2105724435

Associated Practice Facility / Clinic

🏢 John M. Mohrmann, Inc. Facility NPI 1609860725

Medicare Profile & Education

Medical School

Georgetown University School Of Medicine

Graduation Year

1998

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in San Antonio, TX

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

28 Yrs +5.3 yrs vs City Avg

City Avg: 22.7 Yrs

State Avg: 26.2 Yrs

Regional Practice Density

681 Specialists

Practicing in San Antonio, TX (9538 Statewide)

Telehealth Adoption Rate

16.4% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

42.8% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Isaeff (28 Years) 28 Yrs

San Antonio Specialty Average (22.7 Years) 22.7 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	403	158	$213.00	$121.93

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	429	168	$213.00	$122.26
99441 Telephone medical discussion with physician, 5-10 minutes	41	38	$89.00	$53.85

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	409	175	$213.00	$123.93
99441 Telephone medical discussion with physician, 5-10 minutes	270	127	$89.00	$54.10
99442 Telephone medical discussion with physician, 11-20 minutes	69	46	$147.00	$87.43

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	342	187	$213.00	$126.50
99441 Telephone medical discussion with physician, 5-10 minutes	92	71	$89.00	$54.77
99442 Telephone medical discussion with physician, 11-20 minutes	78	57	$147.00	$89.26
99213 Established patient office or other outpatient visit, typically 15 minutes	32	28	$147.00	$89.05

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99442 Telephone medical discussion with physician, 11-20 minutes	398	170	$147.00	$73.14
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	255	162	$174.07	$105.81
99441 Telephone medical discussion with physician, 5-10 minutes	63	49	$89.00	$44.20
99213 Established patient office or other outpatient visit, typically 15 minutes	40	36	$99.97	$72.38

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	580	227	$140.00	$104.50
99213 Established patient office or other outpatient visit, typically 15 minutes	14	12	$90.00	$71.31
93000 Routine ekg using at least 12 leads including interpretation and report	13	13	$90.00	$16.24

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	536	223	$140.00	$103.48
99213 Established patient office or other outpatient visit, typically 15 minutes	52	42	$90.00	$70.39
93000 Routine ekg using at least 12 leads including interpretation and report	16	14	$90.00	$16.25
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	16	16	$175.00	$159.19

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	490	232	$140.00	$99.06
90656 Vaccine for influenza for administration into muscle, 0.5 ml dosage	43	43	$25.00	$18.42
G0008 Administration of influenza virus vaccine	42	42	$25.00	$23.91
99213 Established patient office or other outpatient visit, typically 15 minutes	36	32	$90.00	$67.23
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	34	34	$160.00	$106.11
93000 Routine ekg using at least 12 leads including interpretation and report	13	13	$90.00	$15.55

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License TX K8638

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.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

144897204 (TX)

Medicaid State Provider ID

144867202 (TX)

Commercial Insurance / Payer ID Railroad Medicare

110241471 (TX)

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

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Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events

✅

NPI Profile Active April 21, 2011

NPI status registered as active in NPPES database

📍

Updated Practice Location April 21, 2011

Registered at 1303 MCCULLOUGH AVE, SUITE 542, SAN ANTONIO, TX 782125607 (Tel: 2105724431)

📍

Updated Business Mailing Address April 21, 2011

Registered at 1303 MCCULLOUGH AVE, SUITE 542, SAN ANTONIO, TX 782125607 (Tel: 2105724431)

👤

Provider Name / Credentials Updated April 21, 2011

Recorded as MARK ISAEFF, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) April 21, 2011

Internal Medicine (License #K8638 in TX)

🟢

Initial NPI Registration & Enumeration October 13, 2005

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1104815075

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: October 13, 2005

Last Update: April 21, 2011

Sole Proprietor: Yes

Update or Correct Profile

Mailing Address

1303 Mccullough Ave, Suite 542

San Antonio, TX 782125607

Phone: 2105724431

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.