Keiko Iwahara Greenberg

  • Washington, DC
  • Nephrologist
NPI1588807408PAC ID7315174166
Medicare services, 2024
1,152
Medicare patients, 2024
333
Part D claims, 2024
655
MIPS score, 2024
83
Hospital affiliations
1
Practice address
3301 New Mexico NW Ave, Washington, DC 20016
Practice phone
Call (202) 842-3127
Professional email
Get professional email
Personal email
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Mobile number
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Social profiles

Primary practice

Union Plaza Dialysis Center

Washington, District of Columbia

See all 8 affiliations

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Keiko Iwahara Greenberg is a nephrologist in Washington, District of Columbia

Keiko Greenberg practices at Union Plaza Dialysis Center in Washington, District of Columbia.

Keiko Greenberg's NPI, 1588807408, was assigned on April 7, 2009. Keiko Greenberg graduated from University of Virginia School of Medicine in 2009. Keiko Greenberg holds Maryland license D0079185.

NPI and contact details
Medicare PAC ID
7315174166
NPI enumeration date
April 7, 2009
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(202) 842-3127
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Female
Estimated age
43
Medical school graduation
2009

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)

Keiko Iwahara Greenberg practices at Union Plaza Dialysis Center in Washington, District of Columbia

Keiko Greenberg's primary practice is Union Plaza Dialysis Center, at 3301 New Mexico NW Ave, Washington, DC 20016 in District Of Columbia County. The practice phone is (202) 842-3127.

  • Union Plaza Dialysis Center
    3301 New Mexico NW Ave, Washington, DC 20016 · District Of Columbia CountyPhone(202) 842-3127

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Keiko Iwahara Greenberg is affiliated with 5 sites of care and 3 medical groups

Keiko Greenberg's primary practice is Union Plaza Dialysis Center in Washington, District of Columbia. Keiko Greenberg is also affiliated with MedStar Georgetown University Hospital. The medical group on file is MedStar Medical Group. Dmand AI also links Keiko Greenberg to 2 more dialysis centers, 2 medical groups and 1 group practice or clinic, each named with a free account.

See all 8 affiliations for Keiko Greenberg

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Keiko Iwahara Greenberg's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Keiko Greenberg practices, 4 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Union Plaza Dialysis CenterAvailable with a free account
+4 more sites and 2 medical groupsAvailable with a free account

Source: Dmand AI Technology Install Data

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Keiko Iwahara Greenberg is one of 58 nephrologists in District of Columbia

Nephrology is Keiko Greenberg's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Keiko Greenberg is licensed in Maryland.

Specialties and state licenses

  • Nephrology, MarylandPrimaryLicense D0079185 · taxonomy 207RN0300X

Nephrologists near Keiko Greenberg

Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Keiko Iwahara Greenberg billed Medicare for 1,152 services in 2024

CMS data shows 1,152 Medicare services from Keiko Greenberg across 13 procedure codes in 2024, for 333 Medicare patients. Medicare paid $120,504 for them.

Medicare services, 20241,152
Medicare patients333
Paid by Medicare$120,504
Procedure codes13

Keiko Greenberg's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 1,0012024: 1,0485%
Tests and treatments
2023: 1262024: 10417%

Where Keiko Greenberg's Medicare services took place, 2024

  • In an office32528%
  • In a facility82772%

Keiko Greenberg compared with the District of Columbia median for nephrologists, 2024

  • Keiko Greenberg
  • District of Columbia median
Medicare services
1,152vs 76351% above
Medicare patients
333vs 22449% above
Part D claims
355vs 20871% above

Medians across 51 nephrologists in District of Columbia with Dmand AI profiles that report each measure.

Keiko Greenberg's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Keiko Greenberg

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Keiko Iwahara Greenberg treated 333 Medicare patients in 2024, average age 69

CMS counts 333 Medicare patients who saw Keiko Greenberg in 2024. The largest group is 65 to 74, with 116 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 38% are also on Medicaid. Their average risk score is 4.78, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Keiko Greenberg's median patient age at 62, with 39% women.

Medicare patients, 2024333
Average age69
Average risk score4.78
Also on Medicaid38%

Keiko Greenberg's Medicare patients by age, 2024

Keiko Greenberg's Medicare patients by sex, 2024

  • Women15346%
  • Men18054%

Chronic conditions among Keiko Greenberg's Medicare patients, 2024

  1. Chronic kidney disease75%
  2. High blood pressure75%
  3. High cholesterol75%
  4. Diabetes57%
  5. Ischemic heart disease52%
  6. Arthritis46%
  7. Heart failure44%
  8. Mood disorders32%

Share of Medicare patients with each condition. A patient can have several.

Keiko Greenberg's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 62

Patient panel by sex, all payers

  • Women39%
  • Men59%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Keiko Iwahara Greenberg wrote 655 Medicare Part D claims in 2024

In 2024, Keiko Greenberg wrote 655 Medicare Part D claims for 88 patients. 86% of them were for generic drugs. CMS names the drug for 355 of them, across 16 drugs with 11 or more claims each, at $43,486 in total drug cost. In 2023, CMS named 233 claims across 14 drugs.

Part D claims, 2024655
Drugs named by CMS16
Total drug cost$43,486
Part D patients88

Keiko Greenberg's Part D claims by kind of drug, 2024

  • Generic564 claims86%
  • Brand-name and other91 claims14%

Keiko Greenberg's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 2332024: 35552%

Drugs named by CMS: 16 in 2024, 14 in 2023.

See all prescribing by Keiko Greenberg

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Keiko Iwahara Greenberg scored 83 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Keiko Greenberg for performance year 2024, reported as part of a group. Keiko Greenberg accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Keiko Greenberg as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Keiko Greenberg's MIPS scores, performance year 2024

  • 83of 100Final score
  • 72.9of 100Quality
  • 100of 100Promoting Interoperability
  • 40of 100Improvement Activities
  • 68of 100Cost

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026

For MedTech and pharma teams

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Keiko Iwahara Greenberg received $541 in industry payments from 2019 to 2025

CMS Open Payments shows 7 general payments to Keiko Greenberg from 5 drug and device companies from 2019 to 2025. Food and beverage make up the largest share, 100% of the total. Travere Therapeutics, Inc. paid the most, $247.

General payments to Keiko Greenberg by program year, 2019 to 2025

Companies that paid Keiko Greenberg the most, 2019 to 2025

Share is of all general payments to this clinician.

See all payments to Keiko Greenberg

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Keiko Iwahara Greenberg graduated from University of Virginia School of Medicine

Keiko Greenberg graduated from University of Virginia School of Medicine in 2009.

  1. Medical schoolUniversity of Virginia School of Medicine

Source: Dmand AI Professional Profile Data

Sources for Keiko Iwahara Greenberg's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Keiko Iwahara Greenberg

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Keiko Iwahara Greenberg's NPI number?

Keiko Iwahara Greenberg's NPI number is 1588807408. It was assigned on April 7, 2009, and it is active in the NPI Registry.

What does Keiko Iwahara Greenberg specialize in?

Keiko Iwahara Greenberg is a nephrologist in Washington, District of Columbia. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).

Where does Keiko Iwahara Greenberg practice?

Keiko Greenberg practices at 3301 New Mexico NW Ave, Washington, DC 20016. Keiko Greenberg's primary practice is Union Plaza Dialysis Center in Washington, District of Columbia. Dmand AI also links Keiko Greenberg to 2 dialysis centers, 2 medical groups and 1 group practice or clinic.

What is Keiko Iwahara Greenberg's office phone number?

The practice phone on file for Keiko Greenberg is (202) 842-3127.

What is Keiko Iwahara Greenberg's medical license number?

Keiko Greenberg holds Maryland license D0079185.

Which hospitals is Keiko Iwahara Greenberg affiliated with?

Keiko Greenberg is affiliated with MedStar Georgetown University Hospital.

What medical group is Keiko Iwahara Greenberg part of?

Keiko Greenberg is linked to MedStar Medical Group. Dmand AI links Keiko Greenberg to 2 more medical groups.

Does Keiko Iwahara Greenberg accept Medicare?

Yes. CMS data shows Keiko Greenberg billed Medicare for 1,152 services in 2024, and Keiko Greenberg accepts Medicare assignment.

Does Keiko Iwahara Greenberg offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Keiko Greenberg as offering telehealth services.

What is Keiko Iwahara Greenberg's MIPS score?

Keiko Greenberg's MIPS final score for performance year 2024 is 83 out of 100, reported as part of a group.

Show 6 more questionsShow fewer questions

How many Medicare patients does Keiko Iwahara Greenberg see?

CMS counts 333 Medicare patients who saw Keiko Greenberg in 2024, with an average age of 69.

What services does Keiko Iwahara Greenberg bill to Medicare?

In 2024, Keiko Greenberg's most billed Medicare services were hospital inpatient care (99232), office visit, established patient (99214) and hospital inpatient care (99233).

Where did Keiko Iwahara Greenberg go to medical school?

Keiko Greenberg graduated from University of Virginia School of Medicine in 2009.

What drugs does Keiko Iwahara Greenberg prescribe most?

In 2024 Medicare Part D data, Keiko Greenberg's most prescribed drugs by claims were Amlodipine Besylate, Carvedilol and Jardiance.

Has Keiko Iwahara Greenberg received payments from drug or device companies?

CMS Open Payments shows $541 in general payments to Keiko Greenberg from 5 companies from 2019 to 2025. The largest total came from Travere Therapeutics, Inc.

How long has Keiko Iwahara Greenberg been practicing?

Keiko Greenberg graduated from medical school in 2009, 17 years ago.

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