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

DR. ALEJANDRO MENDEZ CASTILLO M.D.
NPI 1649255076
Radiology - Diagnostic Radiology in Farmington, MO

Active since December 08, 2005PECOS Enrolled
1101 W LIBERTY ST, FARMINGTON, MO 63640(573) 756-6451 Get Directions Write a Review

NPPES record last updated: October 19, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Alejandro Mendez Castillo M.d. NPPES

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

DR. ALEJANDRO MENDEZ CASTILLO M.D. (NPI 1649255076) is an individual diagnostic radiology provider in Farmington, Missouri, licensed in Missouri (2005027156) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Blessing Hospital, and maintains a secondary practice location in Quincy.

NPPES Registry Identity

NPI1649255076
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameDR. ALEJANDRO MENDEZ CASTILLOCredential: M.D.
Location Address1101 W LIBERTY STFarmington, MO 63640-1921
Mailing Address15914 Woodlet Park CtChesterfield, MO 63017-5033 · (573) 999-6849
Sole ProprietorYes
Medical School CMSOtherGraduated 1991
Enumeration DateDecember 8, 2005
Last NPPES UpdateOctober 19, 2026
NPPES CertifiedOctober 19, 2026
✔ NPI 1649255076 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in MO · 2005027156
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
Also ListedRadiology · Vascular & Interventional RadiologyTaxonomy 2085R0204X · License 036109512 (IL)
1101 W LIBERTY ST, Farmington, MO 63640

Secondary Practice Location 1

Location 14800 Maine StQuincy, IL 62305-5875 · Phone (217) 224-6423 · Fax (217) 214-6295

Other Identifiers 6

Medicaid207432501MO
Other4964V4964Ghp
Other140376000Dept Of Labor
Other431142188OSUMercy
Other720096Healthlink
Other1765MO · Bcbs

Accepted Insurance

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Alejandro Mendez Castillo 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 ID2567361322
PECOS Enrollment IDI20031231000416, I20051012001212
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.

Medicare Billing Reassignments

7

Medicare enrollment records show Alejandro Mendez Castillo reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Diagnostic Radiology
1101 W LIBERTY ST
Farmington, MO 63640
  • Reassigned Medicare billing, Missouri enrollment
  • 4 clinicians in this Medicare group
Specialist
1405 N TRUMAN BLVD
Festus, MO 63028
  • Reassigned Medicare billing, Missouri enrollment
  • 12 clinicians in this Medicare group
Emergency Medicine
1015 BOWLES AVENUE
Fenton, MO 63026
  • Reassigned Medicare billing, Missouri enrollment
  • 741 clinicians in this Medicare group
Pediatrics
2927 S . KINGS HIGHWAY BLVD
Saint Louis, MO 63139
  • Reassigned Medicare billing, Missouri enrollment
  • Medicare enrollment name: Ssm Cardinal Glennon Children's Hospital
  • 414 clinicians in this Medicare group
Internal Medicine
1225 SOUTH GRAND BLVD, 2L - DOOR 3,4
Saint Louis, MO 63104
  • Reassigned Medicare billing, Missouri enrollment
  • 1,294 clinicians in this Medicare group
Hospitalist
6000 HOSPITAL DR
Hannibal, MO 63401
  • Reassigned Medicare billing, Missouri and Illinois enrollments
  • Also billed through NPI 1114471737 (Illinois)
  • 192 clinicians in this Medicare group
Diagnostic Radiology
20201 CRAWFORD AVE
Olympia Fields, IL 60461
  • Reassigned Medicare billing, Illinois enrollment
  • 228 clinicians in this Medicare group

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 60

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.

X-ray of chest, 1 view 71045
A chest X-ray, 1 view, is a quick, painless test that produces images of the structures within your chest, such as your heart, lungs, and blood vessels. It helps in diagnosing conditions like pneumonia, heart problems, or lung cancer. You'll stand in front of a machine that emits X-rays, which pass through your body to create the image.
496 services385 patients
X-ray of chest, 2 views 71046
A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.
344 services327 patients
Ct scan head or brain without contrast 70450
A CT scan of the head or brain without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your brain, skull, and other structures inside your head. It helps to detect conditions like strokes, tumors, or injuries. No dye (contrast) is used in this test.
190 services185 patients
Ct scan of chest without contrast 71250
A CT scan of the chest without contrast is a non-invasive imaging procedure. It uses special X-ray equipment to produce detailed images of your chest area, including your lungs and heart. It can help diagnose conditions such as lung diseases or heart disorders. It doesn't involve any dyes or contrast agents.
167 services157 patients
Ct scan of abdomen and pelvis with contrast 74177
A CT scan of the abdomen and pelvis with contrast is an imaging procedure. A special dye, called contrast, is used to make certain areas more visible. This can help identify issues such as infections, tumors, or other abnormalities. The procedure is painless and usually takes about 30 minutes.
166 services150 patients
Ct scan of abdomen and pelvis without contrast 74176
A CT scan of the abdomen and pelvis is a non-invasive medical test. It uses special X-ray equipment to create detailed images of your abdominal and pelvic areas. This helps doctors examine organs, tissues, and vessels. No contrast dye is used in this procedure.
125 services122 patients

Hospital Affiliations CMS Care Compare 4

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

Blessing Hospital

Acute Care Hospitals · Quincy, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140015
Location1005 Broadway StQuincy, IL 62301 · Adams County
Emergency services Birthing friendly

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number260032
LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County
Emergency services Birthing friendly

Parkland Health Center

Acute Care Hospitals · Farmington, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260163
Location1101 W LibertyFarmington, MO 63640 · St. Francois County
Emergency services Birthing friendly

Madison Medical Center

Critical Access Hospitals · Fredericktown, MO
OwnershipVoluntary non-profit - Other
CMS Certification Number261302
Location611 W Main StFredericktown, MO 63645 · Madison County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63640 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
$81.64 typical visit price
range $52.28 – $161.24
Typical copayment $20.41 (range $13.07 – $40.31)
Most-billed visit code 99203
Established Patient
$65.71 typical visit price
range $16.30 – $131.05
Typical copayment $16.42 (range $4.07 – $32.76)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

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

General Acute Care Hospital
1101 W LIBERTY ST
FARMINGTON, MO 63640
Hospitalist
1101 W LIBERTY ST
FARMINGTON, MO 63640
Hospitalist
1101 W LIBERTY ST
FARMINGTON, MO 63640
Hospitalist
1101 W LIBERTY ST
FARMINGTON, MO 63640
Student in an Organized Health Care Education/Training Program
1101 W LIBERTY ST
FARMINGTON, MO 63640
Physician Assistant
1101 W LIBERTY ST
FARMINGTON, MO 63640
Nurse Practitioner
1101 W LIBERTY ST
FARMINGTON, MO 63640
Nurse Practitioner (Family)
1101 W LIBERTY ST
FARMINGTON, MO 63640

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 Alejandro Mendez Castillo's NPI number?

The NPI number for Alejandro Mendez Castillo is 1649255076. It was assigned to this individual provider in the NPPES registry on December 8, 2005.

Where is Alejandro Mendez Castillo located?

Alejandro Mendez Castillo practices at 1101 W Liberty St, Farmington, MO 63640. The listed phone number is (573) 756-6451.

What is Alejandro Mendez Castillo's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Alejandro Mendez Castillo enrolled in Medicare?

Yes. Alejandro Mendez Castillo 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.

Which organizations bill Medicare for Alejandro Mendez Castillo's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alejandro Mendez Castillo reassigns Medicare benefits to 7 organizations: Nrg-Parkland LLC (Farmington, MO), Interventional Pain Institute, LLC (Festus, MO), Ssm Health Care St Louis (Fenton, MO), Ssm Cardinal Glennon Childrens Hospital (Saint Louis, MO), Ssm Health Care Group (Saint Louis, MO) and 2 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alejandro Mendez Castillo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Alejandro Mendez Castillo accept?

Health plans from Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Texas and Oscar Insurance Company list Alejandro Mendez Castillo 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 Alejandro Mendez Castillo affiliated with any hospitals?

According to CMS data, Alejandro Mendez Castillo is affiliated with Blessing Hospital, Barnes Jewish Hospital, Parkland Health Center and Madison Medical Center.

When was this NPI record last updated?

The NPPES record for Alejandro Mendez Castillo was last updated on October 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.