Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARK ANDREW WILLOUGHBY M.D.
NPI 1215931993
Dermatology in Chula Vista, CA

Q: What is Mark Willoughby's NPI number?

The NPI number for Mark Willoughby is 1215931993. It was assigned to this individual provider in the NPPES registry on June 9, 2005.

Q: What is Mark Willoughby's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Q: When was this NPI record last updated?

The NPPES record for Mark Willoughby was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since June 09, 2005PECOS EnrolledAccepts Medicare Assignment

82.5/100

CMS Quality Rating

319 F ST, STE 102, CHULA VISTA, CA 91910(619) 476-1200(619) 420-7849 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

On this page

About Dr. Mark Andrew Willoughby M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARK ANDREW WILLOUGHBY M.D. (NPI 1215931993) is an individual dermatology provider in Chula Vista, California, licensed in California (A69750) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS and is a graduate of Ohio State University College Of Medicine (1997).

NPPES Registry Identity

NPI1215931993

Entity TypeIndividualMale

Primary Taxonomy207N00000X

Provider Legal NameDR. MARK ANDREW WILLOUGHBYCredential: M.D.

Location Address319 F ST, STE 102Chula Vista, CA 91910-2666

Mailing Address319 F St, Ste 102Chula Vista, CA 91910-2666 · (619) 476-1200 · Fax (619) 420-7849

Phone(619) 476-1200

Fax(619) 420-7849

Sole ProprietorNo

Medical School CMSOhio State University College Of MedicineGraduated 1997

Enumeration DateJune 9, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1215931993 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians

Taxonomy Code207N00000X

License✔ Licensed in CA · A69750

Definition

A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.

319 F ST, Chula Vista, CA 91910

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Other Identifiers 1

Medicaid00A697500CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mark Andrew Willoughby M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6204839574

PECOS Enrollment IDI20110222000573

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 24

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Aminolevulinic acid hcl for topical administration, 10% gel, 10 mg J7345

Aminolevulinic acid hcl is a topical gel used to treat certain skin conditions. It works by making affected skin cells more sensitive to light, which is then used to destroy these cells. The gel is applied by a healthcare professional.

16,905 services78 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

1,451 services926 patients

Destruction of precancer skin growth, 2-14 growths 17003

This procedure involves removing 2-14 precancerous skin growths. The growths are treated to prevent them from potentially developing into skin cancer. The process is safe, with minimal discomfort, and promotes healthier skin.

1,164 services254 patients

Pathology examination of tissue using a microscope, intermediate complexity 88305

A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.

759 services483 patients

Biopsy of related skin growth, first growth 11102

A biopsy of a skin growth involves taking a small sample of the growth to examine it under a microscope. This helps determine if the growth is harmful. The procedure is typically quick, with minimal discomfort. It's a crucial step in ensuring your skin's health.

495 services420 patients

Destruction of precancer skin growth, 1 growth 17000

"Destruction of precancer skin growth" is a procedure that eliminates a single precancerous skin growth. This is done to prevent it from developing into skin cancer. The growth may be removed using various methods such as cryotherapy (freezing), laser therapy, or topical medications.

440 services363 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

335 services335 patients

Destruction of precancer skin growth, 15 or more growths 17004

This procedure involves removing 15 or more precancerous skin growths to prevent them from developing into cancer. It's done using various methods like freezing, creams, or minor surgery. The goal is to protect your health by stopping cancer before it starts.

209 services157 patients

Application of ultraviolet light to skin 96900

Application of ultraviolet light to skin is a treatment process where a special type of light is directed onto the skin. It's often used to treat certain skin conditions, like psoriasis or vitiligo. It's a safe, controlled procedure performed by a healthcare professional.

150 services14 patients

Biopsy of related skin growth, each additional growth 11103

A biopsy of related skin growth is a procedure where a small piece of skin growth is removed for testing. If additional growths are identified, they may also be biopsied. This helps in diagnosing skin conditions and planning appropriate treatment.

137 services104 patients

Application of light with debridement to destroy precancer skin growth 96574

This procedure involves applying a special light source to the skin after removing dead tissue (debridement). The light helps destroy precancerous growths, preventing them from developing into skin cancer. It's a safe and effective method to keep your skin healthy.

88 services78 patients

Injection into skin growth, 1-7 growths 11900

This procedure involves injecting medication into 1-7 skin growths. The medication helps to reduce the size of the growths or completely eliminate them. It's a simple, quick, and usually painless process performed by a medical professional.

51 services32 patients

Injection into skin growth, more than 7 growths 11901

This procedure involves injecting medication into multiple skin growths (more than 7) to either shrink them or eliminate them. It's a safe, minimally invasive method often used for benign growths. Comfort during the process is ensured.

51 services15 patients

High dose rate electronic brachytherapy, external 0394T

High Dose Rate Electronic Brachytherapy (HDR EBT) is a precise form of radiation therapy. It involves placing a tiny source of radiation directly into the area needing treatment. This allows a high dose of radiation to be delivered directly to the area, while reducing exposure to surrounding healthy tissues.

41 services22 patients

Obtaining data needed to develop the optimal radiation treatment, 1 treatment area 77280

This procedure involves gathering essential information to create the best radiation treatment plan for a specific area. It includes scanning the treatment area and using this data to calculate the precise dose of radiation needed to target the disease effectively, while sparing healthy tissue.

41 services22 patients

Use of externally generated heat to increase temperature of cancer cell, heating to depths 4.0 cm or less 77600

This procedure involves using a source of heat from outside the body to raise the temperature of cancer cells. The heat is applied up to a depth of 4.0 cm beneath the skin surface. The increase in temperature can help in the treatment of the cancer.

32 services22 patients

Intermediate repair of wound of scalp, underarms, trunk, arms, or legs, 2.6-7.5 cm 12032

This procedure involves the repair of a wound between 2.6-7.5 cm located on the scalp, underarms, trunk, arms, or legs. The process includes cleaning, debridement (removal of damaged tissue), and suturing (stitching) of the wound to promote healing.

30 services29 patients

Removal of cancer skin growth of body, arms, or legs, 1.1-2.0 cm 11602

This procedure involves the surgical removal of a cancerous skin growth on the body, arms, or legs. The growth is between 1.1 and 2.0 cm in size. The goal is to eliminate cancer cells and prevent them from spreading to other parts of the body.

29 services27 patients

Complicated repair of wound of trunk, 2.6-7.5 cm 13101

This service involves the intricate repair of a wound on your body's main structure, between your neck and limbs. The wound measures 2.6-7.5 cm. The procedure includes deep-layer stitching and may involve repairing damaged tissue.

28 services26 patients

Complicated repair of wound of scalp, arms, or legs, 2.6-7.5 cm 13121

This is a procedure to repair a complex wound on your scalp, arm, or leg that is 2.6-7.5 cm long. It involves cleaning, removing damaged tissue, and stitching the wound to promote healing. It's performed under local or general anesthesia.

25 services25 patients

Destruction of skin growth, 1-14 growths 17110

"Destruction of skin growth" refers to a procedure where 1-14 abnormal skin growths are removed. This is done using methods such as freezing, burning, or laser therapy. It helps prevent the growth from causing discomfort or turning into a more serious condition.

19 services11 patients

Removal of noncancer skin growth of body, arms, or legs, 1.1-2.0 cm 11402

This procedure involves the removal of a noncancerous skin growth on the body, arms, or legs that is between 1.1 and 2.0 cm in size. It's a safe and routine procedure performed by a medical professional to improve your skin health and appearance.

18 services14 patients

Punch biopsy, first skin growth 11104

A punch biopsy is a procedure where a small, circular tool is used to remove a sample of skin tissue. This is usually done to test a skin growth for potential issues. You may feel a pinch, but discomfort is minimal. The area heals quickly.

17 services17 patients

Removal of cancer skin growth of body, arms, or legs, 2.1-3.0 cm 11603

This procedure involves the removal of a cancerous skin growth, between 2.1 and 3.0 cm, from the body, arms, or legs. The area is numbed, then the growth is carefully cut out. The goal is to eliminate all cancer cells while minimizing scarring.

14 services14 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91910 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$94.87 typical visit price

range $62.10 – $184.71

Typical copayment $23.71 (range $15.52 – $46.17)

Most-billed visit code 99203

Established Patient

$76.87 typical visit price

range $20.62 – $151.42

Typical copayment $19.21 (range $5.15 – $37.85)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

82.5/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

98.33

Improvement Activities

Cost

43.91

Reported Quality Measures

Colorectal Cancer Screening

Percentage of adults 50-75 years of age who had appropriate screening for colorectal cancer

98%448 patients4/55-star benchmark: 100%

e-Prescribing

At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.

100%45 patients5/55-star benchmark: 100%

Medication Reconciliation

The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.

96%651 patients4/55-star benchmark: 100%

Patient-Specific Education

The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.

100%1,187 patients5/55-star benchmark: 99%

Pneumococcal Vaccination Status for Older Adults

Percentage of patients 65 years of age and older who have ever received a pneumococcal vaccine

84%817 patients4/55-star benchmark: 100%

Provide Patient Access

At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…

72%1,187 patients3/55-star benchmark: 100%

Urinary Incontinence: Assessment of Presence or Absence of Urinary Incontinence in Women Aged 65 Years and Older

Percentage of female patients aged 65 years and older who were assessed for the presence or absence of urinary incontinence within 12 months

98%343 patients4/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ERICK ALFONSO MAFONG M.D.

Dermatology (MOHS-Micrographic Surgery)

319 F ST, STE 102
CHULA VISTA, CA 91910

San Diego County (619) 476-1200

BONITA HOMECARE, INC.

Home Health

319 F ST, SUITE 205
CHULA VISTA, CA 91910

San Diego County (619) 746-6978

CECILIO EMANUEL CROSBY

Home Health

319 F ST, SUITE 205
CHULA VISTA, CA 91910

San Diego County (619) 746-6978

CECILIO EMANUEL CROSBY

Home Health

319 F ST, SUITE 205
CHULA VISTA, CA 91910

San Diego County (619) 746-6978

DR. COLE BRADFORD WILLOUGHBY M.D.

Dermatology (Dermatopathology)

319 F ST, STE 102
CHULA VISTA, CA 91910

San Diego County (619) 476-1200

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Willoughby's NPI number?

The NPI number for Mark Willoughby is 1215931993. It was assigned to this individual provider in the NPPES registry on June 9, 2005.

Where is Mark Willoughby located?

Mark Willoughby practices at 319 F St Ste 102, Chula Vista, CA 91910. The listed phone number is (619) 476-1200.

What is Mark Willoughby's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Is Mark Willoughby enrolled in Medicare?

Yes. Mark Willoughby is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Mark Willoughby was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.