Active NPI 1821482357 Individual Practitioner Male Practitioner

Dr. Nicholas Gaston Callihan , MD

Emergency Medicine • Houston, TX

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Nicholas Callihan, MD is a certified Emergency Medicine practicing in Houston, TX. With approximately 11 years of clinical experience since graduating from Medical College Of Georgia School Of Medicine in 2015, Dr. Callihan delivers high-quality medical care to the local community at 1635 NORTH LOOP W.

Dr. Callihan maintains professional affiliations with Ut Physicians, Memorial Hermann Hospital Based Physician Group and accepts Medicare assignment.

Frequently performed procedures and clinical services include emergency department visit for life threatening or functioning severity, emergency department visit with moderate level of medical decision making, critical care, first. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1635 North Loop W

Houston, TX 77008

Telephone 7138672000

Associated Practice Facility / Clinic

🏢 Memorial Hermann Health System Facility NPI 1730132234

Medicare Profile & Education

Medical School

Medical College Of Georgia School Of Medicine

Graduation Year

2015

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Emergency Medicine in Houston, TX

Established Specialist (10-20 Yrs)

Practitioner Clinical Experience

11 Yrs -3.1 yrs vs City Avg

City Avg: 14.1 Yrs

State Avg: 22.2 Yrs

Regional Practice Density

831 Specialists

Practicing in Houston, TX (5048 Statewide)

Telehealth Adoption Rate

2.2% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

85.6% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Callihan (11 Years) 11 Yrs

Houston Specialty Average (14.1 Years) 14.1 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
99285 Emergency department visit for life threatening or functioning severity	162	161	$1196.81	$179.04
99284 Emergency department visit with moderate level of medical decision making	49	49	$864.78	$123.63
99291 Critical care, first 30-74 minutes	26	26	$1542.35	$216.25
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	22	22	$56.00	$8.13

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	164	159	$1225.44	$181.89
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	49	45	$55.94	$8.34
99284 Emergency department visit with moderate level of medical decision making	46	45	$825.26	$125.07
99291 Critical care, first 30-74 minutes	29	29	$1585.52	$220.04

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	102	99	$1098.18	$183.27
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	48	46	$53.00	$8.55
99284 Emergency department visit with moderate level of medical decision making	47	47	$755.60	$126.21
99291 Critical care, first 30-74 minutes	29	29	$1470.55	$224.09
99283 Emergency department visit with low level of medical decision making	18	18	$406.00	$74.84

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	153	149	$1126.80	$186.02
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	79	78	$53.00	$8.69
99284 Emergency department visit with moderate level of medical decision making	33	32	$810.06	$127.86
99291 Critical care, first 30-74 minutes	32	32	$1514.22	$228.79

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	208	203	$1411.81	$178.46
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	109	100	$74.11	$8.78
99284 Emergency department visit with moderate level of medical decision making	41	41	$1016.00	$123.46
99291 Critical care, first 30-74 minutes	38	38	$1686.24	$230.10
99283 Emergency department visit with low level of medical decision making	22	22	$595.73	$65.15

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	285	271	$1591.29	$175.69
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	194	185	$88.14	$8.63
99284 Emergency department visit with moderate level of medical decision making	78	75	$1059.76	$119.28
99291 Critical care, first 30-74 minutes	38	38	$1837.95	$225.76
99283 Emergency department visit with low level of medical decision making	21	21	$706.29	$62.95

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	140	135	$1493.23	$175.46
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	80	77	$82.25	$8.63
99284 Emergency department visit with moderate level of medical decision making	53	53	$997.21	$119.14
99291 Critical care, first 30-74 minutes	18	18	$1725.78	$226.10
99283 Emergency department visit with low level of medical decision making	14	14	$659.86	$62.86

Medical Specialties & State Licenses

CMS Verified: 2024-09-13

Emergency Medicine Primary Specialty

NUCC Taxonomy Code: 207P00000X

State License TX R6532

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

Hospital & Practice Group Affiliations

Memorial Hermann Hospital Based Physician Group

1635 N Loop W, Houston, TX 770081532

Phone: 7133386565

Ut Physicians

6411 Fannin St, Houston, TX 770301501

Phone: 7137044000

Secondary Practice Locations

6431 Fannin St, Suite Jjl 431

Houston, TX 770301501

Phone: 7135007882

Practice Associates & Co-Workers

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

40 Associated Practitioners

Thang Kim

Nurse Practitioner - Acute Care

NPI 1003631920

Dayna Mcdaniel , CRNA

Nurse Anesthetist, Certified Registered

NPI 1013202555

Certified Registered Nurse Anesthetist

Catherine Plath , CRNA

Nurse Anesthetist, Certified Registered

NPI 1063526531

Certified Registered Nurse Anesthetist

Dr. Maya Prabhu , MD

Anesthesiology - Pain Medicine

NPI 1093889065

Doctor of Medicine (M.D.)

Bhavika Patel , AGACNP-BC, FNP-BC

Nurse Practitioner - Acute Care

NPI 1124309521

Adult-Gerontology Acute Care Nurse Practitioner (Board Certified), Family Nurse Practitioner (Board Certified)

Dr. Yuyu Tai , MD

Emergency Medicine

NPI 1184982043

Doctor of Medicine (M.D.)

Career & Practice History Timeline

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

10 Historical Events

📍

Updated Business Mailing Address June 21, 2021

Registered at 909 FROSTWOOD DR, HOUSTON, TX 770242301 (Tel: 8326555665)

📍

Updated Practice Location August 27, 2018

Registered at 1635 NORTH LOOP W, HOUSTON, TX 77008 (Tel: 7138672000)

📍

Updated Business Mailing Address August 27, 2018

Registered at 1140 BUSINESS CENTER DR STE 201, HOUSTON, TX 770432744 (Tel: 5128406444)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) August 27, 2018

Emergency Medicine (License #R6532 in TX)

✅

NPI Profile Active May 28, 2015

NPI status registered as active in NPPES database

📍

Updated Practice Location May 28, 2015

Registered at 6431 FANNIN ST, SUITE JJL 431, HOUSTON, TX 770301501 (Tel: 7135007882)

📍

Updated Business Mailing Address May 28, 2015

Registered at 6431 FANNIN ST, SUITE JJL 431, HOUSTON, TX 770301501 (Tel: 7135007882)

👤

Provider Name / Credentials Updated May 28, 2015

Recorded as NICHOLAS CALLIHAN, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 28, 2015

Student in an Organized Health Care Education/Training Program

🟢

Initial NPI Registration & Enumeration March 23, 2015

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: 1821482357

Entity Type:

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

Enumeration Date: March 23, 2015

Last Update: September 13, 2024

Sole Proprietor: No

Update or Correct Profile

Mailing Address

909 Frostwood Dr

Houston, TX 770242301

Phone: 8326555665

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.