DR. DAVID KEEBOK WARREN M.D.
NPI 1487947180
Hospitalist in Mesa, AZ

Q: What is David Warren's NPI number?

The NPI number for David Warren is 1487947180. It was assigned to this individual provider in the NPPES registry on May 27, 2011.

Q: What is David Warren's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Q: When was this NPI record last updated?

The NPPES record for David Warren was last updated on June 14, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.

Active since May 27, 2011PECOS EnrolledAccepts Medicare Assignment

255 W BROWN RD, MESA, AZ 85201(480) 985-1093 Get Directions Write a Review

NPPES record last updated: June 14, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 14, 2023, Aug 24, 2022, Oct 3, 2018 and 1 more (4 updates tracked since 2017).

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About Dr. David Keebok Warren M.d. NPPES

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

DR. DAVID KEEBOK WARREN M.D. (NPI 1487947180) is an individual hospitalist provider in Mesa, Arizona, licensed in Arizona (56226) and active in the NPI registry since May 2011. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Tan Valley, and is a graduate of Other (2011).

NPPES Registry Identity

NPI1487947180

Entity TypeIndividualMale

Primary Taxonomy208M00000X

Provider Legal NameDR. DAVID KEEBOK WARRENCredential: M.D.

Location Address255 W BROWN RDMesa, AZ 85201-3404

Mailing AddressPo Box 20610Mesa, AZ 85277-0610 · (480) 985-1093

Phone(480) 985-1093

Sole ProprietorNo

Medical School CMSOtherGraduated 2011

Enumeration DateMay 27, 2011

Last NPPES UpdateJune 14, 20234 updates tracked since enumeration

NPPES CertifiedJune 14, 2023

✔ NPI 1487947180 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians

Taxonomy Code208M00000X

License✔ Licensed in AZ · 56226

Definition

Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.

Also ListedInternal MedicineTaxonomy 207R00000X · License R0341 (TX), 56226 (AZ)

255 W BROWN RD, Mesa, AZ 85201

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Secondary Practice Location 1

Location 1Banner Ironwood Medical Center, 37000 N. Gantzel RoadSan Tan Valley, AZ 85140 · Phone (480) 543-2034 · Fax (480) 543-2647

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter Health, Blue Cross and Blue Shield of Texas and more.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. David Keebok Warren 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 ID3375767312

PECOS Enrollment IDI20181025001381

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 David Warren reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Lifeline Hospitalist Associates LLC

Same address

Internal Medicine

255 W BROWN RD
Mesa, AZ 85201

Reassigned Medicare billing, Arizona enrollment
41 clinicians in this Medicare group

NPI 1265107478 (480) 985-1093

Arizona Post Acute Care Specialists LLC

6.0 mi

Internal Medicine

4022 E PRESIDIO ST
Mesa, AZ 85215

Reassigned Medicare billing, Arizona enrollment
24 clinicians in this Medicare group

NPI 1669246070 (480) 985-1093

Banner Hospital Based Physicians Arizona LLC

7.5 mi

Multi-Specialty

1900 N HIGLEY RD
Gilbert, AZ 85234

Reassigned Medicare billing, Arizona enrollment
1,081 clinicians in this Medicare group

NPI 1124374822 (480) 543-2034

Neeraj Vij MD PLLC

12 mi

Internal Medicine

3636 E SHOMI ST
Phoenix, AZ 85044

Reassigned Medicare billing, Arizona enrollment
9 clinicians in this Medicare group

NPI 1023283892 (480) 985-1093

Banner Cancer Center Specialists LLC

14 mi

Oncology

2901 N CENTRAL AVE STE 160
Phoenix, AZ 85012

Reassigned Medicare billing, Arizona enrollment
470 clinicians in this Medicare group

NPI 1518253152 (602) 747-4000

Banner - University Hospital Based Physicians LLC

14 mi

General Acute Care Hospital

2901 N CENTRAL AVE STE 160
Phoenix, AZ 85012

Reassigned Medicare billing, Arizona enrollment
728 clinicians in this Medicare group

NPI 1750751566 (602) 747-4000

Cogent Healthcare Of Arizona PC

160 mi

Internal Medicine

5700 E HIGHWAY 90
Sierra Vista, AZ 85635

Reassigned Medicare billing, Arizona enrollment
372 clinicians in this Medicare group

NPI 1568758266 (520) 417-4594

Hospitalist Medicine Physicians Of West Virginia, PLLC

1,776 mi

Internal Medicine

2000 EOFF ST
Wheeling, WV 26003

Reassigned Medicare billing, West Virginia enrollment
193 clinicians in this Medicare group

NPI 1649575101 (304) 234-0123

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 12

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.

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.

1,669 services207 patients

Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309

A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.

1,263 services152 patients

Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes 99310

A follow-up nursing facility visit is a routine check-up that typically lasts about 35 minutes. During this visit, your health status is evaluated, any changes in your condition are noted, and necessary adjustments to your care plan are made. It's an essential part of maintaining your health.

414 services112 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.

371 services194 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.

236 services120 patients

Hospital discharge day management, 30 minutes or less 99238

Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.

141 services140 patients

Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more 99306

An initial nursing facility visit is your first meeting with your healthcare team at a nursing facility. Lasting typically 45 minutes, this appointment involves a comprehensive health assessment and the creation of your personalized care plan. It's a crucial step to ensure your health and well-being.

99 services94 patients

Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308

A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.

91 services13 patients

Advance care planning, first 30 minutes 99497

51 services13 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.

16 services11 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.

13 services13 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85201 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

$127.71 typical visit price

range $55.44 – $168.60

Typical copayment $31.92 (range $13.86 – $42.15)

Most-billed visit code 99204

Established Patient

$98.00 typical visit price

range $17.72 – $137.41

Typical copayment $24.50 (range $4.43 – $34.35)

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.

Reported Quality Measures

Care Plan

Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker…

96%122 patients4/55-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.

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431

DME-Oxygen and Supplies · category DC000N

4 suppliers104 claims104 services$12.85 avg. paid by Medicare

Nebulizer, with compressor E0570

DME-Other DME · category DE000N

1 supplier11 claims11 services$5.27 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

4 suppliers121 claims121 services$57.85 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 19

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

DR. NEYCHELLE CHAHAL ROCCA MD

Hospitalist

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 985-1093

CAROL ANN KAPPELMANN

Physical Therapy Assistant

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 833-3988

EVERGREEN MESA CHRISTIAN, L.L.C.

Skilled Nursing Facility

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 833-3988

MESA ARIZONA SNF HEALTHCARE, LLC

Skilled Nursing Facility

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 833-3988

MEHRAN DARZY FNP-C

Nurse Practitioner (Family)

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 985-1093

LIFELINE HOSPITALIST ASSOCIATES LLC

Internal Medicine

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 985-1093

JEREMY LARKIN CONOWAY PTA

Physical Therapy Assistant

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 329-8975

SHARON A CONRAD

Occupational Therapy Assistant

255 W BROWN RD
MESA, AZ 85201

Maricopa County (480) 833-3988

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 David Warren's NPI number?

The NPI number for David Warren is 1487947180. It was assigned to this individual provider in the NPPES registry on May 27, 2011.

Where is David Warren located?

David Warren practices at 255 W Brown Rd, Mesa, AZ 85201. The listed phone number is (480) 985-1093.

What is David Warren's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is David Warren enrolled in Medicare?

Yes. David Warren 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 David Warren's services?

According to the CMS Revalidation Reassignment List (October 2026 release), David Warren reassigns Medicare benefits to 8 organizations: Lifeline Hospitalist Associates LLC (Mesa, AZ), Arizona Post Acute Care Specialists LLC (Mesa, AZ), Banner Hospital Based Physicians Arizona LLC (Gilbert, AZ), Neeraj Vij MD PLLC (Phoenix, AZ), Banner Cancer Center Specialists LLC (Phoenix, AZ) and 3 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 David Warren's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does David Warren accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Blue Cross and Blue Shield of Texas, CareSource and Oscar Health and 1 other insurer list David Warren 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.

When was this NPI record last updated?

The NPPES record for David Warren was last updated on June 14, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.