Your medical history, in one document. Yours.
When a personal health journey crosses years, providers, and specialties, knowing your own history becomes its own challenge. Master Directory is N=1 applied to documentation — a single browser-native application that holds an entire personal medical record in one file you can open, navigate, and share. The patient becomes the architect of their own health knowledge, with a sharable artifact a new provider, a second-opinion specialist, or a family member can open and understand in one sitting.
Modern healthcare scatters your record across institutions. Every clinic runs its own EHR, and nothing connects to anything else. Specialists send notes back and forth. Imaging studies live in a different silo from clinical notes. Hospital admissions arrive as PDFs. Patient-recorded transcripts — if you keep them at all — sit in a folder on your phone. When something complex happens, the burden of holding the whole picture falls back on you.
There is no system designed for that. EHRs are built for clinicians, not patients. Spreadsheets lose narrative. Email threads bury context. Most tools serve their builders, not the patient sitting in the middle of all of it. The result is the experience every patient managing a complex condition eventually arrives at: the longer your medical history, the harder it becomes to know your own history.
Master Directory is a single HTML file that holds an entire personal medical record — clinical notes, imaging studies, surgical records, hospital admissions, transcripts of patient-recorded consultations, a provider directory with specialties and roles, and an analytical layer that surfaces patterns the records reveal in aggregate. It opens in any browser. It requires no install, no account, no server, and no live internet connection after it loads. It travels as a single attachment to anyone who needs to see it: a new physician walking into your care, a second-opinion specialist offering an outside read, a family member trying to understand the picture in one sitting.
Eight tabs organize the record across complementary views — each addressing a different question a patient, clinician, or family member might bring to the file. The eighth tab is the analytical workspace where the record becomes more than a sum of its documents.
A record is more than its individual documents. Patterns become visible only when the documents are taken together — a label or code that propagates across institutional records, a finding that several specialists confirm and one describes differently, a chronic trend that becomes legible only when months and years of documents are read side by side. These patterns matter, but they live nowhere in the documents themselves. They live in the aggregation.
The Strategic Analysis tab compiles long-form analytical cards covering documentation discrepancies, pathology-specific findings, longitudinal imaging and lab trends, and other patterns the records reveal in aggregate. Beneath the cards sits an Issue Hub — a set of issue tags that, when clicked, filter the entire records table to the records bearing that tag. Every record can be retrieved by issue, by date, by provider, or by personal note. The first inline analytics visualization is a Propagation Map that shows, on a single chart, how a specific pattern travels through institutional records over time. More analytics are in development.
The single-file architecture is the design constraint that makes everything else possible. No install. No account. No server. No live internet connection after the initial load. The application opens from a USB drive, an email attachment, a download, or a local folder. It is what a complete medical record looks like when portability is the design goal — not a feature added later.
Master Directory was built collaboratively with Claude in 2026 for a complex multi-year personal health journey. It is in continuous use and continuously updated as care continues. The patient brought domain knowledge of his own care, the standards he wanted the file to meet, and the editorial judgment of what mattered. Claude wrote the code, structured the data, and rendered the visualizations. The collaboration model is part of what the project documents: not "AI writes a tool for me," but "I direct, AI builds, and the result is the work of both."
Master Directory is a working demonstration of DKA methodology applied to personal health documentation. The same approach that captures clinical intelligence in the practitioner-facing CCI applications produces, here, a navigable knowledge architecture for the patient side of the record. Different domain. Same conviction: structured personal knowledge belongs to the individual, not to the institutions that scatter it.
The Strategic Analysis tab is expanding. The Propagation Map is the first inline analytics visualization in production; additional pattern visualizations are designed and in active development. A comprehensive technical and design specification — the construction blueprint for the whole architecture — is the next major artifact, planned to accompany the existing white paper.
Beyond the current build, Master Directory is the proof of concept for a templated N=1 application that any individual or family could adapt to their own complex medical situation. That generalization is on the roadmap. For now, this instance — built for one personal health journey, in continuous use — is the working example of what the methodology produces.
Built under stated limits — what this will never do, and who owns what goes in.
A single file. A complete record. Yours.
If you're an individual navigating a complex medical situation, a practitioner exploring how DKA could help your patients organize their own care, or simply curious about what's possible — we'd like to hear from you.