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Edit this profileAt a glance
- 55 Rolling Oaks Dr Ste 200, Thousand Oaks, CA 91361
About Dr. Rietkerk
Based in Thousand Oaks, CA, William E. Rietkerk, MD MBA is listed in the NPI registry under dermatology. William graduated from University of California, Irvine, California College of Medicine in 2008. According to Medicare claims data, William cared for 6,175 Medicare patients across 15,297 services. The services billed most often include destruction of precancer skin growth, 2-14 growths, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and destruction of precancer skin growth, 1 growth. NPI 1720311400 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (212) 661-3376
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
55 ROLLING OAKS DR STE 200
Thousand Oaks, CA 91361
Conditions Commonly Evaluated or Treated
Within Dermatology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Autoimmune and connective tissue
Cancer care
Pediatric and genetic
Rashes & allergy
Wounds & skin
Most searched conditions
Acne and follicular disorders
Eczema and inflammatory skin disease
Infections and infestations
Pigment, growths, and benign lesions
Skin cancer
Urticaria, itch, and vascular
Infections
Skin growths
Procedures & services
Bladder & bowel
Cosmetic & plastics
Cosmetic dermatology
Diagnostic procedures
- Dermoscopy
- Excisional skin biopsy
- Punch biopsy
- Shave biopsy
- Skin scraping for fungal or mite testing
- Patch testing
- Skin biopsy
Lesion treatment
- Chemical treatment of skin lesions
- Incision and drainage of an abscess
- Intralesional medication injection
- Complex skin lesion excision
- Cryotherapy for skin lesions
- Electrodesiccation and curettage
Medical dermatology treatment
Skin and Scars
Skin cancer surgery
Skin growths
Wound Care
Most searched procedures
Cosmetic
- Acne scar treatment
- Dermal fillers
- Sclerotherapy
- Tattoo removal
Cosmetic and minor surgery
Diagnostic
General dermatology
Infections
Medical dermatology
Nails & hair
Procedures Most Often Billed to Medicare
15,297 services · 6,175 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Destruction of precancer skin growth, 2-14 growths | Procedure | 17003 |
5,448 | More than most peers in Dermatology |
| Destruction of precancer skin growth, 1 growth | Procedure | 17000 |
1,482 | More than most peers in Dermatology |
| Destruction of skin growth, 1-14 growths | Procedure | 17110 |
1,131 | More than most peers in Dermatology |
| Biopsy of related skin growth, first growth | Procedure | 11102 |
620 | More than most peers in Dermatology |
| Biopsy of related skin growth, each additional growth | Procedure | 11103 |
248 | More than most peers in Dermatology |
| Destruction of precancer skin growth, 15 or more growths | Procedure | 17004 |
137 | More often than most peers in Dermatology |
| Intermediate repair of wound of scalp, underarms, trunk, arms, or legs, 2.6-7.5 cm | Procedure | 12032 |
81 | More often than most peers in Dermatology |
| Destruction of skin growth, 15 or more growths | Procedure | 17111 |
54 | More often than most peers in Dermatology |
| Removal of cancer skin growth of body, arms, or legs, 1.1-2.0 cm | Procedure | 11602 |
51 | More often than most peers in Dermatology |
| Punch biopsy, first skin growth | Procedure | 11104 |
43 | More often than most peers in Dermatology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other dermatologists at this location 3
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other dermatologists in Thousand Oaks 7
Same specialty, same city.
More connections — 23 related providers in 3 groups
Trained at University of California, Irvine, California College of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2008 at University of California, Irvine, California College of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Destruction of precancer skin growth, 2-14 growths 7
Providers in CA who bill this service to Medicare most often.
Common questions
What does Dr. Rietkerk specialize in?
Dr. Rietkerk is a dermatologist (skin doctor) in Thousand Oaks, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Dermatology”.
NPI registry
Where is Dr. Rietkerk located?
Dr. Rietkerk is listed at 55 Rolling Oaks Dr Ste 200, Thousand Oaks, CA 91361. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Rietkerk's phone number?
The number on file is (212) 661-3376. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Rietkerk's NPI number?
Dr. Rietkerk's National Provider Identifier is 1720311400. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Rietkerk go to medical school?
Dr. Rietkerk attended University of California, Irvine, California College of Medicine, graduating in 2008. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Rietkerk been practicing?
Dr. Rietkerk has 18 years experience. Calculated from a graduation year of 2008, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Rietkerk do most often?
According to Medicare billing data, Dr. Rietkerk performs procedures including destruction of precancer skin growth, 2-14 growths, destruction of precancer skin growth, 1 growth and destruction of skin growth, 1-14 growths; reads or performs imaging such as superficial and/or low voltage radiation treatment delivery and obtaining data needed to develop the optimal radiation treatment, 1 treatment area; provides treatments such as application of light to destroy precancer skin growth, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Rietkerk confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Rietkerk. If this is you, claiming it is free.
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