Dr. Howard Ken Nakashioya, MD
- Medicare services, 2024
- 1,004
- Medicare patients, 2024
- 637
- Part D claims, 2024
- 299
- MIPS score, 2024
- 100
- Hospital affiliations
- 1
- Practice address
- One Hoag Drive, Newport Beach, CA 92663
- Practice phone
- Call (949) 764-4624
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Nakashioya's professional email, personal email and mobile number
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Dr. Howard Ken Nakashioya is an emergency medicine physician in Newport Beach, California
Dr. Nakashioya practices at Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian.
Dr. Nakashioya's NPI, 1144284001, was assigned on April 17, 2006. Dr. Nakashioya graduated from Keck School of Medicine of USC in 1983. Dr. Nakashioya holds California license G52805.
- NPI
- 1144284001NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8527020668
- NPI enumeration date
- April 17, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (949) 764-4624
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Howard Ken Nakashioya practices at 2 locations in Newport Beach, California
Dr. Nakashioya's primary practice is Hoag Hospital Newport Beach, at One Hoag Drive, Newport Beach, CA 92663 in Orange County. The practice phone is (949) 764-4624. Dr. Nakashioya also practices at Hoag Hospital Newport Beach, 1 Hoag Dr, Newport Beach, CA 92663.
- Hoag Hospital Newport BeachPrimaryOne Hoag Drive, Newport Beach, CA 92663 · Orange CountyPhone(949) 764-4624
- Hoag Hospital Newport Beach1 Hoag Dr, Newport Beach, CA 92663 · Orange CountyPhone(949) 764-4624
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Howard Ken Nakashioya is affiliated with 1 site of care and 2 medical groups
Dr. Nakashioya's primary practice is Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian. The medical group on file is Newport Emergency Medical Group. Dmand AI also links Dr. Nakashioya to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Howard Ken Nakashioya's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nakashioya practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hoag Hospital Newport Beach | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Hoag Memorial Hospital Presbyterian and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Howard Ken Nakashioya is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Nakashioya's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Nakashioya is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Nakashioya is licensed in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Nakashioya
Counts of emergency medicine physicians 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
Dr. Howard Ken Nakashioya billed Medicare for 1,004 services in 2024
CMS data shows 1,004 Medicare services from Dr. Nakashioya across 4 procedure codes in 2024, for 637 Medicare patients. Medicare paid $102,210 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Nakashioya's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7262024: 64611%
- Tests and treatments
- 2023: 4432024: 35819%
Dr. Nakashioya compared with the California median for emergency medicine physicians, 2024
- Dr. Nakashioya
- California median
- Medicare services
- 1,004vs 2653.8 times
- Medicare patients
- 637vs 2432.6 times
- Part D claims
- 180vs 622.9 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Nakashioya'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Howard Ken Nakashioya treated 637 Medicare patients in 2024, average age 79
CMS counts 637 Medicare patients who saw Dr. Nakashioya in 2024. The largest group is 75 to 84, with 239 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 15% are also on Medicaid. Their average risk score is 2.05, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Nakashioya's median patient age at 61, with 53% women.
Dr. Nakashioya's Medicare patients by age, 2024
Dr. Nakashioya's Medicare patients by sex, 2024
- Women36257%
- Men27543%
Chronic conditions among Dr. Nakashioya's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Ischemic heart disease43%
- Chronic kidney disease36%
- Anxiety35%
- Mood disorders35%
- Atrial fibrillation34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nakashioya's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women53%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Howard Ken Nakashioya wrote 299 Medicare Part D claims in 2024
In 2024, Dr. Nakashioya wrote 299 Medicare Part D claims for 181 patients. 93% of them were for generic drugs. CMS names the drug for 180 of them, across 6 drugs with 11 or more claims each, at $1,056 in total drug cost. In 2023, CMS named 225 claims across 6 drugs.
Dr. Nakashioya's Part D claims by kind of drug, 2024
- Generic277 claims93%
- Brand-name22 claims7%
Dr. Nakashioya'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.
Drug classes CMS tracks in Dr. Nakashioya's Part D claims, 2024
- Opioids20%60 of 299 claims
- Antibiotics16%47 of 299 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2252024: 18020%
Drugs named by CMS: 6 in 2024, 6 in 2023.
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
Dr. Howard Ken Nakashioya scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Nakashioya for performance year 2024, reported as part of a group. Dr. Nakashioya accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Nakashioya's MIPS scores, performance year 2024
- 100of 100Final score
- 96.4of 100Quality
- 40of 100Improvement Activities
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
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Dr. Howard Ken Nakashioya received $121 in industry payments in 2019
CMS Open Payments shows 1 general payment to Dr. Nakashioya from 1 drug or device company in 2019. Food and beverage make up the largest share, 100% of the total. Relypsa, Inc. paid the most, $121.
Companies that paid Dr. Nakashioya the most, 2019 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Howard Ken Nakashioya has 1 award and honors on record
Dmand AI lists 1 award for Dr. Nakashioya.
Awards and honors for Dr. Nakashioya
- Undated
- Checkbook Top Doc
Source: Dmand AI Professional Profile Data
Dr. Howard Ken Nakashioya graduated from Keck School of Medicine of USC
Dr. Nakashioya graduated from Keck School of Medicine of USC in 1983.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Howard Ken Nakashioya accepts plans from 1 insurance carrier
Dr. Nakashioya is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Howard Ken Nakashioya's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Howard Ken Nakashioya
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Howard Ken Nakashioya's NPI number?
Dr. Howard Ken Nakashioya's NPI number is 1144284001. It was assigned on April 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Howard Ken Nakashioya?
Dr. Howard Ken Nakashioya is an emergency medicine physician in Newport Beach, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Howard Ken Nakashioya practice?
Dr. Nakashioya practices at One Hoag Drive, Newport Beach, CA 92663. Dr. Nakashioya also practices at 1 Hoag Dr, Newport Beach, CA 92663. Dr. Nakashioya's primary practice is Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian. Dmand AI also links Dr. Nakashioya to 1 medical group.
What is Dr. Howard Ken Nakashioya's office phone number?
The practice phone on file for Dr. Nakashioya is (949) 764-4624.
What is Dr. Howard Ken Nakashioya's medical license number?
Dr. Nakashioya holds California license G52805.
Which hospitals is Dr. Howard Ken Nakashioya affiliated with?
Dr. Nakashioya practices at Hoag Hospital Newport Beach in Newport Beach, California.
What medical group is Dr. Howard Ken Nakashioya part of?
Dr. Nakashioya is linked to Newport Emergency Medical Group. Dmand AI links Dr. Nakashioya to 1 more medical group.
Does Dr. Howard Ken Nakashioya accept Medicare?
Yes. CMS data shows Dr. Nakashioya billed Medicare for 1,004 services in 2024, and Dr. Nakashioya accepts Medicare assignment.
What is Dr. Howard Ken Nakashioya's MIPS score?
Dr. Nakashioya's MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
How many Medicare patients does Dr. Howard Ken Nakashioya see?
CMS counts 637 Medicare patients who saw Dr. Nakashioya in 2024, with an average age of 79.
Show 7 more questionsShow fewer questions
Is Dr. Howard Ken Nakashioya board certified?
Yes. Dr. Nakashioya is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Howard Ken Nakashioya bill to Medicare?
In 2024, Dr. Nakashioya's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and critical care (99291).
Where did Dr. Howard Ken Nakashioya go to medical school?
Dr. Nakashioya graduated from Keck School of Medicine of USC in 1983.
What drugs does Dr. Howard Ken Nakashioya prescribe most?
In 2024 Medicare Part D data, Dr. Nakashioya's most prescribed drugs by claims were Ondansetron ODT, Hydrocodone-Acetaminophen and Cefdinir.
Has Dr. Howard Ken Nakashioya received payments from drug or device companies?
CMS Open Payments shows $121 in general payments to Dr. Nakashioya from 1 company from 2019 to 2019. The largest total came from Relypsa, Inc.
How long has Dr. Howard Ken Nakashioya been practicing?
Dr. Nakashioya graduated from medical school in 1983, 43 years ago.
What insurance does Dr. Howard Ken Nakashioya accept?
Dr. Nakashioya is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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