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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

KEVIN CORNELIUS MCMAHON M.D.
NPI 1124339528
Psychiatry & Neurology - Neurology in Seguin, TX

Active since June 30, 2010PECOS EnrolledAccepts Medicare Assignment
100/100
CMS Quality Rating
417 S. KING STREET, GRMG NEUROLOGY ASSOCIATES, SEGUIN, TX 78155(830) 484-4608 Get Directions Write a Review

NPPES record last updated: June 19, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Sep 26, 2019, Oct 21, 2016 (2 updates tracked since 2016).

About Kevin Cornelius Mcmahon M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

KEVIN CORNELIUS MCMAHON M.D. (NPI 1124339528) is an individual neurology provider in Seguin, Texas, licensed in Texas (Q3049) and active in the NPI registry since June 2010. He is enrolled in Medicare PECOS, is affiliated with Valley Regional Medical Center, and maintains a secondary practice location in Edinburg.

NPPES Registry Identity

NPI1124339528
Entity TypeIndividualMale
Primary Taxonomy2084N0400X
Provider Legal NameKEVIN CORNELIUS MCMAHONCredential: M.D.
Location Address417 S. KING STREET, GRMG NEUROLOGY ASSOCIATESSeguin, TX 78155-5126
Mailing Address1215 E Court St, Guadalupe Regional Medical GroupSeguin, TX 78155-5129 · (830) 484-4608
Phone(830) 484-4608
Sole ProprietorYes
Medical School CMSOtherGraduated 2010
Enumeration DateJune 30, 2010
Last NPPES UpdateJune 19, 20262 updates tracked since enumeration
NPPES CertifiedJune 19, 2026
✔ NPI 1124339528 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychiatry & Neurology · NeurologyAllopathic & Osteopathic Physicians
Taxonomy Code2084N0400X
License✔ Licensed in TX · Q3049
Definition
A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
417 S. KING STREET, Seguin, TX 78155
Open in Google Maps ↗

Secondary Practice Location 1

Location 12406 Stirling AveEdinburg, TX 78539-2706 · Phone (413) 464-6740

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Kevin Cornelius Mcmahon M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8022320654
PECOS Enrollment IDI20150709002498
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 10

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
44 services30 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
30 services30 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
27 services21 patients
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221
Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.
24 services24 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
23 services19 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
18 services15 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Valley Regional Medical Center

Acute Care Hospitals · Brownsville, TX
2/5 CMS rating
OwnershipProprietary
CMS Certification Number450662
Location100 A Alton GloorBrownsville, TX 78526 · Cameron County
Emergency services Birthing friendly

Rio Grande Regional Hospital

Acute Care Hospitals · Mcallen, TX
3/5 CMS rating
OwnershipProprietary
CMS Certification Number450711
Location101 E Ridge RdMcallen, TX 78503 · Hidalgo County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78155 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$126.40 typical visit price
range $54.84 – $166.88
Typical copayment $31.60 (range $13.71 – $41.72)
Most-billed visit code 99204
Established Patient
$97.05 typical visit price
range $17.52 – $136.11
Typical copayment $24.26 (range $4.38 – $34.02)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Individually scored
Quality99.31
Improvement Activities40

Reported Quality Measures

Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)
Lower rates are better for this measure.
22%85 patients4/55-star benchmark: 91%
Documentation of Current Medications in the Medical Record
97%1,734 patients4/55-star benchmark: 100%
Falls: Screening for Future Fall Risk
87%423 patients4/55-star benchmark: 100%
Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan
74%942 patients4/55-star benchmark: 98%
Preventive Care and Screening: Screening for High Blood Pressure and Follow-Up Documented
39%1,603 patients3/55-star benchmark: 61%
Statin Therapy for the Prevention and Treatment of Cardiovascular Disease
81%234 patients4/55-star benchmark: 91%
Use of High-Risk Medications in Older Adults
Lower rates are better for this measure.
Patients appropriateDiagnosis: 2% · 438 patients
Patients totalRate: 1% · 438 patients
0%438 patients5/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Kevin Mcmahon's NPI number?

The NPI number for Kevin Mcmahon is 1124339528. It was assigned to this individual provider in the NPPES registry on June 30, 2010.

Where is Kevin Mcmahon located?

Kevin Mcmahon practices at 417 S. King Street Grmg Neurology Associates, Seguin, TX 78155. The listed phone number is (830) 484-4608.

What is Kevin Mcmahon's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.

Is Kevin Mcmahon enrolled in Medicare?

Yes. Kevin Mcmahon is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Kevin Mcmahon accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 5 other insurers list Kevin Mcmahon as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Kevin Mcmahon affiliated with any hospitals?

According to CMS data, Kevin Mcmahon is affiliated with Valley Regional Medical Center and Rio Grande Regional Hospital.

When was this NPI record last updated?

The NPPES record for Kevin Mcmahon was last updated on June 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 52 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.