Dr. Garret G. De Castro, MD
- Medicare services, 2018
- 1,107
- Part D claims, 2019
- 1,512
- Affiliated sites
- 1
- Medical groups
- 2
- State license
- 1
- Practice address
- 606 Oakesdale Ave Sw Ste C200 Suite C200, Renton, WA 98057
- Practice phone
- Call (866) 259-1629
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Harmonycares Medical Group
Primary care practice · Renton, Washington
Find Dr. De Castro's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Garret G. De Castro is an internist in Everett, Washington
Dr. De Castro practices at Harmonycares Medical Group in Renton, Washington.
Dr. De Castro's NPI, 1427273895, was assigned on April 13, 2007. Dr. De Castro holds Washington license MD00047669.
- NPI
- 1427273895NPI Registry (opens in a new tab)
- NPI enumeration date
- April 13, 2007
- NPI status
- Active
- Practice phone
- (866) 259-1629
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Garret G. De Castro practices in Renton and Everett
Dr. De Castro's primary practice is Harmonycares Medical Group, at 606 Oakesdale Ave Sw Ste C200 Suite C200, Renton, WA 98057. The practice phone is (866) 259-1629. The NPI Registry lists Dr. De Castro's practice address as 1700 13th St, Everett, WA 98201.
- Harmonycares Medical GroupPrimary606 Oakesdale Ave Sw Ste C200 Suite C200, Renton, WA 98057Phone(866) 259-1629
- NPI Registry address1700 13th St, Everett, WA 98201 · Snohomish CountyPhone(866) 259-1629
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Garret G. De Castro is affiliated with 1 site of care and 2 medical groups
Dr. De Castro's primary practice is Harmonycares Medical Group in Renton, Washington. The medical group on file is Kaiser Permanente Northwest. Dmand AI also links Dr. De Castro to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Garret G. De Castro's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. De Castro practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Harmonycares Medical Group | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Garret G. De Castro is one of 2,689 internists in Washington
Internal medicine is Dr. De Castro's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. De Castro is licensed in Washington.
Specialties and state licenses
- Internal medicine, WashingtonPrimary
Internists near Dr. De Castro
Counts of internists 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. Garret G. De Castro billed Medicare for 1,107 services in 2018
CMS data shows 1,107 Medicare services from Dr. De Castro across 7 procedure codes in 2018. Medicare paid $101,346 for them. Every service was in an office.
Dr. De Castro's Medicare services by type, 2018
- Office and hospital visits1,024
- Other services83
Dr. De Castro compared with the Washington median for internists, 2018
- Dr. De Castro
- Washington median
- Medicare services
- 1,107vs 3643.0 times
- Part D claims
- 1,512vs 1828.3 times
Medians across 2,604 internists in Washington with Dmand AI profiles that report each measure.
Dr. De Castro's most billed Medicare procedure codes, 2018
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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. De Castro and other internists in Washington.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Garret G. De Castro's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Dr. De Castro's median patient age at 69, with 67% women.
Dr. De Castro's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women67%
- Men33%
Source: Dmand AI Patient Panel Data
Dr. Garret G. De Castro wrote 1,512 Medicare Part D claims in 2019
In 2019, Dr. De Castro wrote 1,512 Medicare Part D claims. They cover 49 drugs, with $36,146 in total drug cost. In 2018, CMS named 11,503 claims across 150 drugs.
Dr. De Castro's most prescribed drugs by claims, 2019
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, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 11,5032019: 1,51287%
Drugs named by CMS: 49 in 2019, 150 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Sources for Dr. Garret G. De Castro'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| 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. Garret G. De Castro
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. Garret G. De Castro's NPI number?
Dr. Garret G. De Castro's NPI number is 1427273895. It was assigned on April 13, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Garret G. De Castro?
Dr. Garret G. De Castro is an internist in Everett, Washington. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Garret G. De Castro practice?
Dr. De Castro practices at 606 Oakesdale Ave Sw Ste C200 Suite C200, Renton, WA 98057. Dr. De Castro also practices at 1700 13th St, Everett, WA 98201. Dr. De Castro's primary practice is Harmonycares Medical Group in Renton, Washington. Dmand AI also links Dr. De Castro to 1 medical group.
What is Dr. Garret G. De Castro's office phone number?
The practice phone on file for Dr. De Castro is (866) 259-1629.
What is Dr. Garret G. De Castro's medical license number?
Dr. De Castro holds Washington license MD00047669.
What medical group is Dr. Garret G. De Castro part of?
Dr. De Castro is linked to Kaiser Permanente Northwest. Dmand AI links Dr. De Castro to 1 more medical group.
Does Dr. Garret G. De Castro accept Medicare?
Yes. CMS data shows Dr. De Castro billed Medicare for 1,107 services in 2018.
What services does Dr. Garret G. De Castro bill to Medicare?
In 2018, Dr. De Castro's most billed Medicare services were medical service (99336), home visit (99349) and care management and other visits (99490).
What drugs does Dr. Garret G. De Castro prescribe most?
In 2019 Medicare Part D data, Dr. De Castro's most prescribed drugs by claims were Quetiapine Fumarate, Atorvastatin Calcium and Levothyroxine Sodium.
How long has Dr. Garret G. De Castro been practicing?
Dr. De Castro's NPI was assigned in 2007.
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