# Timothy Chang, MD, La Jolla CA: Reviews Source: Local AI Registry, https://localairegistry.com/biz/ca/la-jolla/timothy-chang-md-la-jolla-ca. Free to reuse with a link back. By Steve Lee, founder and CEO of Local AI Registry. Updated 2026-10-09. Canonical: https://localairegistry.com/biz/ca/la-jolla/timothy-chang-md-la-jolla-ca ## Photos - ![Photo 1](https://localairegistry.com/api/photo?src=https%3A%2F%2Fseoaesthetic-assets.sfo3.cdn.digitaloceanspaces.com%2Fphotos%2Fcmv1ntt7k0et7yea7dwhj4vyz%2F0.jpg) - ![Photo 2](https://localairegistry.com/api/photo?src=https%3A%2F%2Fseoaesthetic-assets.sfo3.cdn.digitaloceanspaces.com%2Fphotos%2Fcmv1ntt7k0et7yea7dwhj4vyz%2F1.jpg) ## In short Timothy Chang, MD is a dermatologist in La Jolla, CA. Its AI Score is 36 of 100, which is poor. What each mark on this page means: https://localairegistry.com/methodology#marks ## Key facts | Fact | Value | | --- | --- | | Type | Dermatologist | | Address | 9850 Genesee Ave #850, La Jolla, CA 92037, USA | | Hours | Mon to Fri 8 AM to 5 PM · Closed Sat to Sun | | Phone | (858) 240-9789 | | Rating | 4.9 across 313 reviews on Google | | Updated | October 9, 2026 | ## All the details Every row is something the owner can add or correct. Each one is marked Confirmed, Visitor submitted or AI guess, with where it came from. | Group | Fact | Value | Mark | Evidence | | --- | --- | --- | --- | --- | | Location info | Address | 9850 Genesee Ave #850, La Jolla, CA 92037, USA | Confirmed | Google Business Profile | | Location info | Description | 9850 Genesee Ave #850, La Jolla, CA 92037 | Confirmed | Google Business Profile | | Location info | Hours | Mon to Fri 8:00 AM to 5:00 PM · Sat to Sun Closed | Confirmed | Google Business Profile | | Location info | Name | Timothy Chang, MD | Confirmed | Google Business Profile | | Location info | Phone | (858) 240-9789 | Confirmed | Google Business Profile | | Hours | Monday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile | | Hours | Tuesday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile | | Hours | Wednesday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile | | Hours | Thursday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile | | Hours | Friday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile | | Hours | Saturday | Closed | Confirmed | Google Business Profile | | Hours | Sunday | Closed | Confirmed | Google Business Profile | | Services | Service | Acne treatment | AI guess | | | Services | Service | Eczema treatment | AI guess | | | Services | Service | Mole removal | AI guess | | | Services | Service | Psoriasis treatment | AI guess | | | Services | Service | Rosacea treatment | AI guess | | | Services | Service | Skin allergy testing | AI guess | | | Services | Service | Skin cancer screening | AI guess | | | Services | Service | Wart removal | AI guess | | | Team | La Jolla, CA | | Confirmed | Google Business Profile | | Links | Facebook | https://www.facebook.com/coastalderm | AI guess | Business website | | Links | Instagram | https://www.instagram.com/drlajolla | AI guess | Business website | | Links | Website | https://www.coastaldermonline.com/ | Confirmed | Google Business Profile | | Links | Yelp | https://www.yelp.com/biz/coastal-medical-and-cosmetic-dermatology-la-jolla | AI guess | Business website | ## Services and prices Add your services so AI can say what you offer ### Known for Share your review link so AI can say what you're known for ## The team 1 person is named on this page. ### La Jolla, CA | Field | Value | Mark | Evidence | | --- | --- | --- | --- | ## Visiting Timothy Chang Address: 9850 Genesee Ave #850, La Jolla, CA 92037, USA. Phone: (858) 240-9789. Hours: Mon to Fri 8 AM to 5 PM · Closed Sat to Sun. (Confirmed, Google Business Profile.) ### Parking and getting in Add your parking so AI can tell people where to park Add how to find your door so AI can walk people in ### Nearby | Place | Type | Distance | | --- | --- | --- | | Brick & Bell | Cafe | 1 min walk | | Ximed Parking Garage | Parking lot | 1 min walk | | Staff Parking Lot C | Parking lot | 2 min walk | | Triton Ball Park | Park | 2 min walk | | Parking Lot A | Parking garage | 3 min walk | | Parking Deck D | Parking garage | 3 min walk | ## Reputation 4.9 average across 313 reviews: Google 313. (Confirmed, read October 9, 2026.) The practice is noted for its efficiency and expertise in surgical procedures, though some patients report issues with communication and scheduling. (AI guess, from 313 reviews.) ### What people like - Timely consultations and exams - Expertise in Mohs surgery - Painless cyst removals ### What people do not like - Long waits in the exam room - Front office mistakes - Unaddressed concerns during appointments ### Press Add a press story so AI can say who's written about you ### Awards Add an award so AI can name it ### Directories Get listed in directories so AI can tell you're real ## Questions people ask ### Street parking near here, any good? ### Any names worth asking for? ### best dermatologist in La Jolla, CA ### Busiest day at Timothy Chang, anyone know? ### Do they post anywhere? ### anyone been to both here and Alyssa Nash? ### topical numbing, standard or extra ### financing at Timothy Chang, is there any? ### credentials of whoever treats you at Timothy Chang? ### is it the doctor here or a technician? ### never been to Timothy Chang in La Jolla, how does it go? ### what do I actually do when I get here? ### planning a Saturday visit, is that a wasted trip ### Can I get in this week at Timothy Chang? ### booked my first appointment here, how does it go ### who is actually holding the needle at Timothy Chang? ### Why do people rate Timothy Chang? ### Downsides nobody puts in a five star review? ### paying in instalments, is that possible here ### anywhere on Genesee to sit while I wait ## The AI Score: 36 of 100 It measures how likely AI engines are to recommend a business, and how accurately. La Jolla dermatologists run 27 to 54. Fair starts at 45, good at 65. Timothy Chang scores 36, below the La Jolla average of 45. The same method scores every business on the registry. | Signal | Weight | Score | What it measures | Timothy Chang | | --- | --- | --- | --- | --- | | Retrieval grounding | 26 | 25 | Whether you appear in the ranked results AI retrieves and cites: AI-Overview citations, organic top-10 for your money queries, and the Bing index ChatGPT leans on. | Poor | | Off-property attestation | 20 | 42 | Volume and consistency of what others say about you: YouTube mentions, branded web mentions, third-party “best-of” lists. The cause of retrievability. | Poor | | AI visibility | 14 | 0 | Whether ChatGPT, Gemini, Perplexity, and AI Overviews name you, and whether they name you for the right service. | Poor | | Reviews & response | 12 | 68 | The star average is only one input. We also read volume, velocity, the specificity of review language, and response cadence. Specific reviews are what AI quotes verbatim. | Good | | Backlink & citation authority | 8 | 56 | Domain authority and editorial quality of the sources that attest to you. | Fair | | Google Business Profile | 8 | 79 | Required and recommended fields; update cadence. The listing AI pulls from first. | Good | | Speed & mobile | 7 | 76 | Core Web Vitals at the 75th percentile, on a real phone. | Good | | Content freshness & schema | 5 | 82 | Crawl recency, intent alignment, valid JSON-LD, canonicals. | Good | Full method: https://localairegistry.com/methodology How AI decides what to say about a dermatologist: https://localairegistry.com/methodology#how-ai-decides-med-spa. What to check before you choose one: https://localairegistry.com/methodology#how-to-choose-med-spa ## Entity map Every person, place, organization and treatment named on this page, with a stable ID and a public reference. The JSON-LD below connects them to each other. | Entity | Type | ID on this page | Same as | Relationship to Timothy Chang | | --- | --- | --- | --- | --- | | Timothy Chang, MD | MedicalBusiness | #business | https://www.coastaldermonline.com/ | Subject of this page | | La Jolla, CA | Person | #team-la-jolla | | | | La Jolla, California | City | #city | | City Timothy Chang is in | | Local AI Registry | Organization | #publisher | https://localairegistry.com | Publisher of this page | | Steve Lee | Person | #author | https://localairegistry.com/team/steve-lee | Author of this page | ## Topical map Where this page sits in the registry. It's one profile among the dermatologists in La Jolla, linked to the lists and towns around it. ### Lists - Best dermatologists in La Jolla: https://localairegistry.com/leaderboards/ca/la-jolla/dermatologist - Best businesses in La Jolla: https://localairegistry.com/leaderboards/ca/la-jolla ### Nearby - /san-jose: https://localairegistry.com/leaderboards/ca/san-jose - /los-angeles: https://localairegistry.com/leaderboards/ca/los-angeles - /san-francisco: https://localairegistry.com/leaderboards/ca/san-francisco - /san-diego: https://localairegistry.com/leaderboards/ca/san-diego - /irvine: https://localairegistry.com/leaderboards/ca/irvine - /mountain-view: https://localairegistry.com/leaderboards/ca/mountain-view ### Every list - Every leaderboard in California: https://localairegistry.com/leaderboards/ca ## References ### Sources cited - [1] Google Business Profile, https://www.google.com/maps/place/?q=place_id:ChIJRbHtDoEH3IARLyUXiJqjiyQ (accessed Oct 9, 2026) - [2] AI engine output: ChatGPT and Gemini, read by Local AI Registry on Oct 23, 2026; Perplexity via DataForSEO on Oct 23, 2026, https://localairegistry.com/methodology (accessed Oct 23, 2026) - [3] coastaldermonline.com, https://www.coastaldermonline.com/ (accessed Oct 23, 2026)