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

DR. ALEXANDER NGUYEN CASTILLO MD
NPI 1164059226
Internal Medicine in Henderson, NV

Q: What is Alexander Castillo's NPI number?

The NPI number for Alexander Castillo is 1164059226. It was assigned to this individual provider in the NPPES registry on March 26, 2020.

Q: What is Alexander Castillo's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since March 26, 2020PECOS Enrolled

58.85/100

CMS Quality Rating

3175 SAINT ROSE PKWY STE 121, HENDERSON, NV 89052(702) 802-5100 Get Directions Write a Review

NPPES record last updated: August 14, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: Aug 14, 2026, Jul 17, 2023, Mar 30, 2020 and 1 more (4 updates tracked since 2020).

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About Dr. Alexander Nguyen Castillo Md NPPES

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

DR. ALEXANDER NGUYEN CASTILLO MD (NPI 1164059226) is an individual internal medicine provider in Henderson, Nevada, licensed in Nevada (24010) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS and is a graduate of Other (2020).

NPPES Registry Identity

NPI1164059226

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. ALEXANDER NGUYEN CASTILLOCredential: MD

Location Address3175 SAINT ROSE PKWY STE 121Henderson, NV 89052-3507

Mailing Address3175 Saint Rose Pkwy Ste 121Henderson, NV 89052-3507 · (702) 802-5100

Phone(702) 802-5100

Sole ProprietorNo

Medical School CMSOtherGraduated 2020

Enumeration DateMarch 26, 2020

Last NPPES UpdateAugust 14, 20264 updates tracked since enumeration

NPPES CertifiedAugust 14, 2026

✔ NPI 1164059226 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in NV · 24010

Definition

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.

3175 SAINT ROSE PKWY STE 121, Henderson, NV 89052

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Alexander Nguyen Castillo Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID3274957352

PECOS Enrollment IDI20230803000691

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 5

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.

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.

308 services144 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.

91 services91 patients

Advance care planning, first 30 minutes 99497

Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.

87 services86 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

60 services35 patients

Hospital discharge day management, more than 30 minutes 99239

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

60 services59 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 89052 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

$131.25 typical visit price

range $57.07 – $173.24

Typical copayment $32.81 (range $14.26 – $43.31)

Most-billed visit code 99204

Established Patient

$100.60 typical visit price

range $18.27 – $140.96

Typical copayment $25.15 (range $4.56 – $35.24)

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.

58.85/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

39.4

Improvement Activities

Cost

49.45

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

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