Physician Profile
William E. Rietkerk, MD MBA
Unclaimed ProfileAbout 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.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
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
Most searched conditions
- Acne
- Eczema
- Hair loss
- Melanoma
- Precancerous sun spot
- Psoriasis
- Rosacea
- Skin cancer
Acne and follicular disorders
- Folliculitis
- Hidradenitis suppurativa
Eczema and inflammatory skin disease
- Seborrheic dermatitis
Infections and infestations
- Cellulitis
- Foot fungus
- Herpes simplex of the skin
- Molluscum contagiosum
- Scabies
- Shingles
- Warts
Pigment, growths, and benign lesions
- Melasma
- Seborrheic keratosis
Skin cancer
- Basal cell skin cancer
- Squamous cell skin cancer
Urticaria, itch, and vascular
- Chronic itching
- Excessive sweating
- Hives
Autoimmune and connective tissue
- Vitiligo
Infections
- Ringworm
Rashes & allergy
- Poison Ivy
Skin growths
- Keloid scars
Procedures & services
Most searched procedures
- Botox
- Chemical peel
- Laser hair removal
- Microneedling
- Mole removal
- Skin cancer screening
Diagnostic procedures
- Patch testing
- Skin biopsy
Lesion treatment
- Complex skin lesion excision
- Cryotherapy for skin lesions
- Electrodesiccation and curettage
- Incision and drainage of an abscess
Medical dermatology treatment
- Botulinum toxin treatment for excessive sweating
Cosmetic
- Acne scar treatment
- Dermal fillers
- Sclerotherapy
- Tattoo removal
Cosmetic and minor surgery
- Sun spot removal
Cosmetic dermatology
- Laser skin resurfacing
- Laser treatment of vascular lesions
Diagnostic
- Mole mapping
- Skin scraping test
General dermatology
- Biologic drug management
- Cortisone shot for cysts
Infections
- Wart Removal
Medical dermatology
- Light Therapy
Nails & hair
- Ingrown toenail removal
Skin cancer surgery
- Mohs surgery
Skin growths
- Cyst Removal
- Lipoma removal
- Skin Tag Removal
- Steroid injection for keloids
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. Guide.md cannot book appointments or pass on messages — please call the office directly.
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.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.