Active NPI 1750449831 Individual Practitioner Male Practitioner

Dr. Nicolas Athanassiou , MD

Anesthesiology • Houston, TX

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Nicolas Athanassiou, MD is a certified Anesthesiology practicing in Houston, TX. With approximately 40 years of clinical experience since completing medical education in 1986, Dr. Athanassiou delivers high-quality medical care to the local community at 6565 FANNIN ST STE B452.

Dr. Athanassiou is affiliated with U S Anesthesia Partners Of Texas, Pa and accepts Medicare assignment.

Frequently performed procedures and clinical services include insertion of artery tube for blood sampling or infusion through skin, ultrasound of heart blood flow, valves and chambers, doppler ultrasound study of color-directed heart blood flow, rate, and valve function. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

6565 Fannin St Ste B452

Houston, TX 770302703

Telephone 7134413620

Fax 7137902082

Medicare Profile & Education

Medical School

Other

Graduation Year

1986

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Anesthesiology in Houston, TX

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

40 Yrs +18.4 yrs vs City Avg

City Avg: 21.6 Yrs

State Avg: 24.9 Yrs

Regional Practice Density

1164 Specialists

Practicing in Houston, TX (4818 Statewide)

Telehealth Adoption Rate

1.1% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

96.0% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Athanassiou (40 Years) 40 Yrs

Houston Specialty Average (21.6 Years) 21.6 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
36620 Insertion of artery tube for blood sampling or infusion through skin	14	13	$714.00	$43.68
93320 Ultrasound of heart blood flow, valves and chambers	13	13	$880.00	$17.14
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	13	13	$654.00	$2.94
93312 Ultrasound of heart with probe in esophagus, with report	13	13	$1875.00	$102.77

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36620 Insertion of artery tube for blood sampling or infusion through skin	24	24	$714.00	$45.29
00537 Anesthesia for procedure to assess heart electrical activity	23	23	$3075.26	$234.08
00410 Anesthesia for procedure to correct abnormal heart rhythm	18	18	$906.25	$54.56
01922 Anesthesia for x-ray or radiation therapy	18	18	$1283.25	$89.88
93312 Ultrasound of heart with probe in esophagus, with report	14	14	$1875.00	$107.11
01924 Anesthesia for x-ray on arteries	13	12	$2860.96	$196.76
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	13	13	$654.00	$3.08
36556 Insertion of non-tunneled central venous tube for infusion (5 years or older)	12	12	$1800.00	$85.84
00560 Anesthesia for procedure on heart and large blood vessels	12	12	$4219.50	$317.49
93320 Ultrasound of heart blood flow, valves and chambers	11	11	$880.00	$17.84

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36620 Insertion of artery tube for blood sampling or infusion through skin	50	49	$714.00	$45.58
01924 Anesthesia for x-ray on arteries	32	30	$2683.41	$193.10
01844 Anesthesia for placement or revision of blood flow shunt	30	27	$2540.40	$163.91
76937 Ultrasonic guidance for blood vessel access	27	25	$385.00	$14.12
93312 Ultrasound of heart with probe in esophagus, with report	26	26	$1875.00	$111.18
00537 Anesthesia for procedure to assess heart electrical activity	24	24	$3077.63	$242.74
93320 Ultrasound of heart blood flow, valves and chambers	24	24	$880.00	$18.44
00410 Anesthesia for procedure to correct abnormal heart rhythm	22	21	$854.18	$55.36
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	22	22	$654.00	$3.20
36556 Insertion of non-tunneled central venous tube for infusion (5 years or older)	22	22	$1800.00	$86.98
93503 Insertion of tube in pulmonary artery for monitoring	18	18	$2380.00	$90.91
01916 Anesthesia for diagnostic x-ray procedure on arteries or veins	15	15	$2079.30	$150.96
00567 Anesthesia for heart artery bypass grafting on heart-lung machine	15	15	$9609.15	$486.85
01922 Anesthesia for x-ray or radiation therapy	12	12	$1576.88	$103.01

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36620 Insertion of artery tube for blood sampling or infusion through skin	37	36	$714.00	$46.19
93312 Ultrasound of heart with probe in esophagus, with report	28	27	$1875.00	$112.63
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	27	27	$654.00	$3.25
93320 Ultrasound of heart blood flow, valves and chambers	25	24	$880.00	$18.74
00537 Anesthesia for procedure to assess heart electrical activity	23	23	$3217.11	$218.19
01844 Anesthesia for placement or revision of blood flow shunt	23	22	$2683.76	$189.11
01916 Anesthesia for diagnostic x-ray procedure on arteries or veins	14	14	$2246.46	$161.55
00410 Anesthesia for procedure to correct abnormal heart rhythm	14	12	$792.32	$52.52
36556 Insertion of non-tunneled central venous tube for infusion (5 years or older)	13	13	$1800.00	$87.88
01924 Anesthesia for x-ray on arteries	13	12	$2469.46	$174.06
93503 Insertion of tube in pulmonary artery for monitoring	13	13	$2380.00	$91.33
00560 Anesthesia for procedure on heart and large blood vessels	12	12	$6209.63	$325.16

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36620 Insertion of artery tube for blood sampling or infusion through skin	46	45	$714.00	$46.65
36556 Insertion of non-tunneled central venous tube for infusion (5 years or older)	14	13	$1800.00	$90.41
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	13	13	$654.00	$3.34
93312 Ultrasound of heart with probe in esophagus, with report	13	13	$1875.00	$115.38
93503 Insertion of tube in pulmonary artery for monitoring	12	12	$2380.00	$93.93
93320 Ultrasound of heart blood flow, valves and chambers	12	12	$880.00	$19.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36620 Insertion of artery tube for blood sampling or infusion through skin	73	71	$714.00	$46.10
01922 Anesthesia for x-ray or radiation therapy	31	31	$1569.15	$109.63
36556 Insertion of non-tunneled central venous tube for infusion (5 years or older)	29	28	$1800.00	$88.11
01844 Anesthesia for placement or revision of blood flow shunt	27	27	$2963.36	$228.48
00537 Anesthesia for procedure to assess heart electrical activity	25	24	$3144.96	$220.08
01924 Anesthesia for x-ray on arteries	25	24	$2794.32	$201.18
00410 Anesthesia for procedure to correct abnormal heart rhythm	24	23	$878.50	$57.72
00560 Anesthesia for procedure on heart and large blood vessels	22	21	$4041.41	$306.95
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	21	21	$654.00	$3.26
93312 Ultrasound of heart with probe in esophagus, with report	21	21	$1875.00	$112.30
93503 Insertion of tube in pulmonary artery for monitoring	19	19	$2380.00	$91.86
00350 Anesthesia for other procedure on large blood vessel of neck	18	15	$3316.88	$263.72
93320 Ultrasound of heart blood flow, valves and chambers	17	17	$880.00	$18.79
01270 Anesthesia for other procedure on artery of upper leg	14	13	$3979.18	$321.01
01926 Anesthesia for x-ray on artery of brain, heart, or chest	13	13	$3353.31	$237.47
01916 Anesthesia for diagnostic x-ray procedure on arteries or veins	12	12	$2096.63	$157.04

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36620 Insertion of artery tube for blood sampling or infusion through skin	106	103	$714.00	$45.60
36556 Insertion of non-tunneled central venous tube for infusion (5 years or older)	41	41	$1800.00	$101.05
01922 Anesthesia for x-ray or radiation therapy	36	36	$1357.11	$100.94
93312 Ultrasound of heart with probe in esophagus, with report	28	27	$1875.00	$111.90
00560 Anesthesia for procedure on heart and large blood vessels	28	28	$5119.43	$408.54
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	27	26	$654.00	$3.25
00537 Anesthesia for procedure to assess heart electrical activity	27	27	$3297.48	$240.78
00410 Anesthesia for procedure to correct abnormal heart rhythm	27	27	$785.33	$54.09
93320 Ultrasound of heart blood flow, valves and chambers	26	25	$880.00	$18.73
01844 Anesthesia for placement or revision of blood flow shunt	26	23	$2613.54	$203.64
93503 Insertion of tube in pulmonary artery for monitoring	22	22	$2380.00	$107.30
01916 Anesthesia for diagnostic x-ray procedure on arteries or veins	15	14	$2397.33	$183.61
00350 Anesthesia for other procedure on large blood vessel of neck	15	15	$3612.53	$262.39
00567 Anesthesia for heart artery bypass grafting on heart-lung machine	14	14	$8777.43	$658.06
01924 Anesthesia for x-ray on arteries	13	13	$2794.77	$211.94

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36620 Insertion of artery tube for blood sampling or infusion through skin	96	91	$714.00	$52.24
93312 Ultrasound of heart with probe in esophagus, with report	44	44	$1875.00	$111.51
93325 Doppler ultrasound study of color-directed heart blood flow, rate, and valve function	42	42	$654.00	$3.24
93320 Ultrasound of heart blood flow, valves and chambers	40	40	$880.00	$18.66
36556 Insertion of non-tunneled central venous tube for infusion (5 years or older)	36	36	$1800.00	$122.07
93503 Insertion of tube in pulmonary artery for monitoring	29	29	$2380.00	$132.05
00560 Anesthesia for procedure on heart and large blood vessels	18	17	$4455.89	$362.21
01844 Anesthesia for placement or revision of blood flow shunt	17	15	$2212.00	$180.70
00537 Anesthesia for procedure to assess heart electrical activity	14	14	$3391.50	$260.41
01916 Anesthesia for diagnostic x-ray procedure on arteries or veins	12	11	$2231.25	$181.53
01270 Anesthesia for other procedure on artery of upper leg	12	11	$3758.42	$239.35
00562 Anesthesia for procedure on heart and large blood vessels using heart-lung machine (1 year or older)	12	12	$11463.67	$565.67
01922 Anesthesia for x-ray or radiation therapy	11	11	$1254.91	$96.57

Medical Specialties & State Licenses

CMS Verified: 2026-07-14

Anesthesiology Primary Specialty

NUCC Taxonomy Code: 207L00000X

State License TX L3914

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

147621003 (TX)

Medicaid State Provider ID

2315269 (LA)

Commercial Insurance / Payer ID Railroad Medicare

P00246625 (TX)

Hospital & Practice Group Affiliations

U S Anesthesia Partners Of Texas, Pa

6565 Fannin St, Houston, TX 770302703

Phone: 7136204000

Practice Associates & Co-Workers

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

40 Associated Practitioners

Ernst Etienne , PA

Physician Assistant

NPI 1013071117

Physician Assistant

Dr. Faisal Masud , MD

Anesthesiology - Critical Care Medicine

NPI 1023054525

Doctor of Medicine (M.D.)

Elizabeth Kinder , APRN

Nurse Practitioner - Acute Care

NPI 1063902898

Advanced Practice Registered Nurse

Dr. Anh Nguyen , MD

Psychiatry & Neurology - Neurology

NPI 1073826467

Doctor of Medicine (M.D.)

Jamie Hauerland

Nurse Practitioner - Acute Care

NPI 1073939922

Kevin Smith , RN

Nurse Practitioner - Acute Care

NPI 1083189864

Registered Nurse

Career & Practice History Timeline

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

10 Historical Events

📍

Updated Practice Location July 14, 2026

Registered at 6565 FANNIN ST STE B452, HOUSTON, TX 770302703 (Tel: 7134413620)

📍

Updated Business Mailing Address July 14, 2026

Registered at 6565 FANNIN ST STE B452, HOUSTON, TX 770302703 (Tel: 7134413620)

📍

Updated Practice Location August 25, 2020

Registered at 1500 CITYWEST BLVD STE 300, HOUSTON, TX 770422549 (Tel: 7136204000)

📍

Updated Business Mailing Address August 25, 2020

Registered at PO BOX 840853, DALLAS, TX 752840853

✅

NPI Profile Active November 20, 2012

NPI status registered as active in NPPES database

📍

Updated Practice Location November 20, 2012

Registered at 2411 FOUNTAIN VIEW DR, SUITE 200, HOUSTON, TX 770574817 (Tel: 7136204000)

📍

Updated Business Mailing Address November 20, 2012

Registered at 2411 FOUNTAIN VIEW DR STE 200, HOUSTON, TX 770574832 (Tel: 7136204000)

👤

Provider Name / Credentials Updated November 20, 2012

Recorded as NICOLAS ATHANASSIOU, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) November 20, 2012

Anesthesiology (License #L3914 in TX)

🟢

Initial NPI Registration & Enumeration December 04, 2006

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: 1750449831

Entity Type:

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

Enumeration Date: December 04, 2006

Last Update: July 14, 2026

Sole Proprietor: No

Update or Correct Profile

Mailing Address

6565 Fannin St Ste B452

Houston, TX 770302703

Phone: 7134413620

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.