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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.

KARLA K UNDERWOOD CRNA
NPI 1720046113
Nurse Anesthetist, Certified Registered in Nashville, TN

Active since May 03, 2006Accepts Medicare Assignment
59.46/100
CMS Quality Rating
3601 THE VANDERBILT CLINIC AVE, NASHVILLE, TN 37232(615) 322-5000 Get Directions Write a Review

NPPES record last updated: September 22, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Karla K Underwood Crna NPPES

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

KARLA K UNDERWOOD CRNA (NPI 1720046113) is an individual nurse anesthetist, certified registered in Nashville, Tennessee, licensed in Tennessee (11288) and active in the NPI registry since May 2006. She is affiliated with Tennova Healthcare-clarksville, maintains a secondary practice location in Clarksville, and is a graduate of Other (1998).

NPPES Registry Identity

NPI1720046113
Entity TypeIndividualFemale
Primary Taxonomy367500000X
Provider Legal NameKARLA K UNDERWOODCredential: CRNA
Location Address3601 THE VANDERBILT CLINIC AVENashville, TN 37232-5100
Mailing Address3841 Green Hills Village Dr Ste 200Nashville, TN 37215-2691 · (615) 322-5000
Phone(615) 322-5000
Sole ProprietorNo
Medical School CMSOtherGraduated 1998
Enumeration DateMay 3, 2006
Last NPPES UpdateSeptember 22, 2026
NPPES CertifiedSeptember 22, 2026
✔ NPI 1720046113 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Anesthetist, Certified RegisteredPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code367500000X
License✔ Licensed in TN · 11288
Definition
(1) A licensed registered nurse with advanced specialty education in anesthesia who, in collaboration with appropriate health care professionals, provides preoperative, intraoperative, and postoperative care to patients and assists in management and resuscitation of critical patients in intensive care, coronary care, and emergency situations. Nurse anesthetists are certified following successful completion of credentials and state licensure review and a national examination directed by the Council on Certification of Nurse Anesthetists. (2) A registered nurse who is qualified by special training to administer anesthesia in collaboration with a physician or dentist and who can assist in the care of patients who are in critical condition.
3601 THE VANDERBILT CLINIC AVE, Nashville, TN 37232
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Secondary Practice Location 1

Location 1651 Dunlop LnClarksville, TN 37040-5015 · Phone (931) 551-1795

Other Identifiers 1

Medicaid3627775TN

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cigna Healthcare, Oscar Health, 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

Karla K Underwood Crna 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 ID4587552146
PECOS Enrollment IDI20040306000055

Medicare Billing Reassignments

2

Medicare enrollment records show Karla Underwood reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Anesthesia Medical Group, PC
0.5 mi
Anesthesiology
110 29TH AVE N, STE 301
Nashville, TN 37203
  • Reassigned Medicare billing, Tennessee enrollment
  • Medicare enrollment name: Anesthesia Medical Group, P.C.
  • 757 clinicians in this Medicare group
NPI 1215932413 (615) 327-4304
Nashville Anesthesia PLLC
6.7 mi
Anesthesiology
391 WALLACE RD
Nashville, TN 37211
  • Reassigned Medicare billing, Tennessee enrollment
  • 86 clinicians in this Medicare group
NPI 1225081805 (954) 939-5000

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

Hospital Affiliations CMS Care Compare

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

Tennova Healthcare-Clarksville

Acute Care Hospitals · Clarksville, TN
1/5 CMS rating
OwnershipProprietary
CMS Certification Number440035
Location651 Dunlop LaneClarksville, TN 37040 · Montgomery County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37232 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
$121.80 typical visit price
range $52.64 – $160.89
Typical copayment $30.45 (range $13.16 – $40.22)
Most-billed visit code 99204
Established Patient
$66.01 typical visit price
range $16.72 – $131.41
Typical copayment $16.50 (range $4.18 – $32.85)
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.

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.

59.46/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality52.31
Improvement Activities40

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.

HALEY EILEEN HOYING
Nurse Anesthetist, Certified Registered
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000
ADRIANO FERRANTE
Anesthesiology
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000
H DANIELLE ADAMS CRNA
Nurse Anesthetist, Certified Registered
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000
KIMBERLY BROWN ENSEY RN, APRN
Nurse Practitioner (Family)
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000
RILEY N STEINMAN CRNA
Nurse Anesthetist, Certified Registered
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000
MELISSA ELAINE BERGES MORALES MD
Internal Medicine (Pulmonary Disease)
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000
OMALI LONGWELL
Nurse Anesthetist, Certified Registered
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000
DR. HARISH BANGALORE SIDDAIAH M.D.
Anesthesiology (Critical Care Medicine)
3601 THE VANDERBILT CLINIC AVE
NASHVILLE, TN 37232
Davidson County (615) 322-5000

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 Karla Underwood's NPI number?

The NPI number for Karla Underwood is 1720046113. It was assigned to this individual provider in the NPPES registry on May 3, 2006.

Where is Karla Underwood located?

Karla Underwood practices at 3601 The Vanderbilt Clinic Ave, Nashville, TN 37232. The listed phone number is (615) 322-5000.

What is Karla Underwood's specialty?

The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.

Is Karla Underwood enrolled in Medicare?

Yes. Karla Underwood 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 Karla Underwood's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Karla Underwood reassigns Medicare benefits to 2 organizations: Anesthesia Medical Group, PC (Nashville, TN) and Nashville Anesthesia PLLC (Nashville, 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 Karla Underwood's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Karla Underwood accept?

Health plans from Cigna Healthcare, Oscar Health and Oscar Insurance Company list Karla Underwood 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 Karla Underwood affiliated with any hospitals?

According to CMS data, Karla Underwood is affiliated with Tennova Healthcare-Clarksville.

When was this NPI record last updated?

The NPPES record for Karla Underwood was last updated on September 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 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.