ANA MARIA CASTANEDA GUARDERAS M.D.
NPI 1194174318
Emergency Medicine in Memphis, TN

Q: What is Ana Castaneda Guarderas's NPI number?

The NPI number for Ana Castaneda Guarderas is 1194174318. It was assigned to this individual provider in the NPPES registry on June 8, 2016.

Q: What is Ana Castaneda Guarderas's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Active since June 08, 2016PECOS EnrolledAccepts Medicare Assignment

75.06/100

CMS Quality Rating

877 JEFFERSON AVE, MEMPHIS, TN 38103(901) 545-7100(901) 545-8996 Get Directions Write a Review

NPPES record last updated: January 15, 2020. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jan 15, 2020, Aug 22, 2019 (2 updates tracked since 2019).

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About Ana Maria Castaneda Guarderas M.d. NPPES

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

ANA MARIA CASTANEDA GUARDERAS M.D. (NPI 1194174318) is an individual emergency medicine provider in Memphis, Tennessee, licensed in Tennessee (59139) and active in the NPI registry since June 2016. She is enrolled in Medicare PECOS, is affiliated with Methodist Hospitals Of Memphis, and maintains a secondary practice location in Aventura.

NPPES Registry Identity

NPI1194174318

Entity TypeIndividualFemale

Primary Taxonomy207P00000X

Provider Legal NameANA MARIA CASTANEDA GUARDERASCredential: M.D.

Location Address877 JEFFERSON AVEMemphis, TN 38103

Mailing Address877 Jefferson AveMemphis, TN 38103-2807 · (312) 933-0244

Phone(901) 545-7100

Fax(901) 545-8996

Sole ProprietorNo

Medical School CMSOtherGraduated 2010

Enumeration DateJune 8, 2016

Last NPPES UpdateJanuary 15, 20202 updates tracked since enumeration

✔ NPI 1194174318 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

Licenses✔ Licensed in TN · 59139✔ Licensed in FL · 23751

Definition

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.

877 JEFFERSON AVE, Memphis, TN 38103

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Secondary Practice Location 1

Location 120900 Biscayne Blvd, GME, South Tower, Room 821Aventura, FL 33180-1407 · Phone (305) 692-3392

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company.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

Ana Maria Castaneda Guarderas 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 ID9335432533

PECOS Enrollment IDI20191017000863

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

Medicare enrollment records show Ana Castaneda Guarderas reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Methodist University Emergency Physicians PLLC

0.8 mi

Emergency Medicine

1265 UNION AVE
Memphis, TN 38104

Reassigned Medicare billing, Tennessee enrollment
253 clinicians in this Medicare group

NPI 1023899291 (901) 516-7000

Methodist South Emergency Physicians, PLLC

7.6 mi

Emergency Medicine

1300 WESLEY DR
Memphis, TN 38116

Reassigned Medicare billing, Tennessee enrollment
252 clinicians in this Medicare group

NPI 1609657873 (901) 516-3700

Methodist North Emergency Physicians, PLLC

10 mi

Emergency Medicine

3960 NEW COVINGTON PIKE
Memphis, TN 38128

Reassigned Medicare billing, Tennessee enrollment
250 clinicians in this Medicare group

NPI 1801677083 (901) 516-5200

Germantown Emergency Physicians, PLLC

13 mi

Emergency Medicine

7691 POPLAR AVE
Germantown, TN 38138

Reassigned Medicare billing, Tennessee enrollment
251 clinicians in this Medicare group

NPI 1518747526 (901) 516-6000

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 3

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.

Critical care, first 30-74 minutes 99291

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

98 services97 patients

Emergency department visit with high level of medical decision making 99285

An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.

59 services59 patients

Emergency department visit with moderate level of medical decision making 99284

An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.

23 services22 patients

Hospital Affiliations CMS Care Compare 2

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

Methodist Hospitals Of Memphis

Acute Care Hospitals · Memphis, TN

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number440049

Location1265 Union Ave Suite 700Memphis, TN 38104 · Shelby County

Emergency services Birthing friendly

Regional One Health

Acute Care Hospitals · Memphis, TN

1/5 CMS rating

OwnershipGovernment - Hospital District or Authority

CMS Certification Number440152

Location877 Jefferson AvenueMemphis, TN 38103 · Shelby County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 38103 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

$81.53 typical visit price

range $52.64 – $160.89

Typical copayment $20.38 (range $13.16 – $40.22)

Most-billed visit code 99203

Established Patient

$93.60 typical visit price

range $16.72 – $131.41

Typical copayment $23.40 (range $4.18 – $32.85)

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.

75.06/100

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

Scored as part of a group practice

Quality

56.46

Improvement Activities

Cost

71.87

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.

MIMILY HARSONO MD

Pediatrics (Neonatal-Perinatal Medicine)

877 JEFFERSON AVE
MEMPHIS, TN 38103

Shelby County (901) 545-7100

JESSICA DORAN DNP, CRNA

Nurse Anesthetist, Certified Registered

877 JEFFERSON AVE
MEMPHIS, TN 38103

Shelby County (901) 448-5893

SHELBY COUNTY HEALTH CARE CORPORATION

Skilled Nursing Facility

877 JEFFERSON AVE, 3RD FLOOR, ADAMS PAVILION
MEMPHIS, TN 38103

Shelby County (901) 515-4300

EDSON RUIZ MD

Pediatrics (Neonatal-Perinatal Medicine)

877 JEFFERSON AVE
MEMPHIS, TN 38103

Shelby County (901) 448-5950

MS. MARLA GIDDENS CRNA

Nurse Anesthetist, Certified Registered

877 JEFFERSON AVE
MEMPHIS, TN 38103

Shelby County (901) 545-7100

MARY BETH HALL-KRASNOVE FNP

Nurse Practitioner (Family)

877 JEFFERSON AVE
MEMPHIS, TN 38103

Shelby County (901) 545-8090

MEGAN TALLEY

Dietitian, Registered

877 JEFFERSON AVE
MEMPHIS, TN 38103

Shelby County (901) 545-7753

COURTNEY H PARKER CRNA

Nurse Anesthetist, Certified Registered

877 JEFFERSON AVE
MEMPHIS, TN 38103

Shelby County (901) 545-7100

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 Ana Castaneda Guarderas's NPI number?

The NPI number for Ana Castaneda Guarderas is 1194174318. It was assigned to this individual provider in the NPPES registry on June 8, 2016.

Where is Ana Castaneda Guarderas located?

Ana Castaneda Guarderas practices at 877 Jefferson Ave, Memphis, TN 38103. The listed phone number is (901) 545-7100.

What is Ana Castaneda Guarderas's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Ana Castaneda Guarderas enrolled in Medicare?

Yes. Ana Castaneda Guarderas 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 Ana Castaneda Guarderas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ana Castaneda Guarderas reassigns Medicare benefits to 4 organizations: Methodist University Emergency Physicians PLLC (Memphis, TN), Methodist South Emergency Physicians, PLLC (Memphis, TN), Methodist North Emergency Physicians, PLLC (Memphis, TN) and Germantown Emergency Physicians, PLLC (Germantown, TN). 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 Ana Castaneda Guarderas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ana Castaneda Guarderas accept?

Health plans from Oscar Insurance Company list Ana Castaneda Guarderas 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 Ana Castaneda Guarderas affiliated with any hospitals?

According to CMS data, Ana Castaneda Guarderas is affiliated with Methodist Hospitals Of Memphis and Regional One Health.

When was this NPI record last updated?

The NPPES record for Ana Castaneda Guarderas was last updated on January 15, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.