diff --git a/.changeset/calm-boxes-reflect.md b/.changeset/calm-boxes-reflect.md
new file mode 100644
index 0000000..0403ec6
--- /dev/null
+++ b/.changeset/calm-boxes-reflect.md
@@ -0,0 +1,5 @@
+---
+'@ssecd/jkn': minor
+---
+
+implement Rekam Medis web service
diff --git a/.env.example b/.env.example
index 43fa3ed..dcd2223 100644
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,4 @@
+JKN_PPK_CODE=
 JKN_CONS_ID=
 JKN_CONS_SECRET=
 JKN_VCLAIM_USER_KEY=
@@ -5,3 +6,4 @@ JKN_ANTREAN_USER_KEY=
 JKN_APOTEK_USER_KEY=
 JKN_PCARE_USER_KEY=
 JKN_ICARE_USER_KEY=
+JKN_REKAM_MEDIS_USER_KEY=
diff --git a/README.md b/README.md
index d7aacd2..0f8b3ea 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ npm install @ssecd/jkn
 
 Instalasi juga dapat dilakukan menggunakan `PNPM` atau `YARN`
 
+> ⚠ Untuk dukungan *type* pada API Rekam Medis, perlu menambahkan development dependensi `@types/fhir` dengan perintah `npm install --save-dev @types/fhir` atau `pnpm i -D @types/fhir`.
+
 ## Penggunaan
 
 Penggunaan paket ini sangatlah sederhana, cukup menginisialisasi global instansi pada sebuah modul atau file seperti berikut:
@@ -125,6 +127,14 @@ Konfigurasi mengikuti interface berikut:
 
 ```ts
 interface Config {
+	/**
+	 * Kode PPK yang diberikan BPJS.
+	 *
+	 * Diperlukan untuk melakukan proses encryption
+	 * pada web service eRekam Medis.
+	 */
+	ppkCode: string;
+
 	/**
 	 * Cons ID dari BPJS
 	 *
@@ -169,7 +179,7 @@ interface Config {
 
 	/**
 	 * User key i-Care dari BPJS
-	 * 
+	 *
 	 * Umumnya user key i-Care ini nilai sama dengan user key VClaim
 	 * untuk FKRTL dan PCare untuk FKTP
 	 *
@@ -177,6 +187,13 @@ interface Config {
 	 */
 	icareUserKey: string;
 
+	/**
+	 * User key eRekam Medis dari BPJS
+	 *
+	 * @default process.env.JKN_REKAM_MEDIS_USER_KEY
+	 */
+	rekamMedisUserKey: string;
+
 	/**
 	 * Berupa mode "development" dan "production". Secara default akan
 	 * membaca nilai environment variable NODE_ENV atau "development"
@@ -207,6 +224,7 @@ interface Config {
 - ✅ Apotek _(experimental)_
 - 🧩 PCare _([partial](https://github.com/ssecd/jkn/pull/26))_
 - ✅ i-Care
+- ✅ Rekam Medis
 
 ## Kontribusi
 
diff --git a/package.json b/package.json
index 856acd0..dbb9615 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,7 @@
 	},
 	"devDependencies": {
 		"@changesets/cli": "^2.26.2",
+		"@types/fhir": "^0.0.38",
 		"@types/node": "^20.5.0",
 		"@typescript-eslint/eslint-plugin": "^6.4.0",
 		"@typescript-eslint/parser": "^6.4.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 84aef19..8e7d7e5 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1,4 +1,4 @@
-lockfileVersion: '6.1'
+lockfileVersion: '6.0'
 
 settings:
   autoInstallPeers: true
@@ -13,6 +13,9 @@ devDependencies:
   '@changesets/cli':
     specifier: ^2.26.2
     version: 2.26.2
+  '@types/fhir':
+    specifier: ^0.0.38
+    version: 0.0.38
   '@types/node':
     specifier: ^20.5.0
     version: 20.5.0
@@ -582,6 +585,10 @@ packages:
     resolution: {integrity: sha512-mEo1sAde+UCE6b2hxn332f1g1E8WfYRu6p5SvTKr2ZKC1f7gFJXk4h5PyGP9Dt6gCaG8y8XhwnXWC6Iy2cmBng==}
     dev: true
 
+  /@types/fhir@0.0.38:
+    resolution: {integrity: sha512-0ia8Ng9OR6yI3J1+TkZxAzp02oarQLfM0mGBUjVf1+7X+hD9UW7TNz7/heRP5QQ9evyRz89Ok/IxSuubx2TzMg==}
+    dev: true
+
   /@types/is-ci@3.0.0:
     resolution: {integrity: sha512-Q0Op0hdWbYd1iahB+IFNQcWXFq4O0Q5MwQP7uN0souuQ4rPg1vEYcnIOfr1gY+M+6rc8FGoRaBO1mOOvL29sEQ==}
     dependencies:
diff --git a/src/base.ts b/src/base.ts
index c3edbd7..c095ee2 100644
--- a/src/base.ts
+++ b/src/base.ts
@@ -1,4 +1,4 @@
-import { Fetcher, SendOption, Type } from './fetcher.js';
+import { Config, Fetcher, SendOption, Type } from './fetcher.js';
 
 export abstract class BaseApi<T extends Type = Type> {
 	protected abstract readonly type: T;
@@ -8,6 +8,10 @@ export abstract class BaseApi<T extends Type = Type> {
 	protected send<R>(option: SendOption) {
 		return this.fetcher.send<T, R>(this.type, option);
 	}
+
+	protected get config(): Config {
+		return this.fetcher.configuration;
+	}
 }
 
 type CacheKey = `${Type}${string}`;
diff --git a/src/fetcher.ts b/src/fetcher.ts
index 6d15c21..3948726 100644
--- a/src/fetcher.ts
+++ b/src/fetcher.ts
@@ -5,9 +5,17 @@ type MaybePromise<T> = T | Promise<T>;
 
 export type Mode = 'development' | 'production';
 
-export type Type = 'vclaim' | 'antrean' | 'apotek' | 'pcare' | 'icare';
+export type Type = 'vclaim' | 'antrean' | 'apotek' | 'pcare' | 'icare' | 'rekamMedis';
 
 export interface Config {
+	/**
+	 * Kode PPK yang diberikan BPJS.
+	 *
+	 * Diperlukan untuk melakukan proses encryption
+	 * pada web service eRekam Medis.
+	 */
+	ppkCode: string;
+
 	/**
 	 * Cons ID dari BPJS
 	 *
@@ -60,6 +68,13 @@ export interface Config {
 	 */
 	icareUserKey: string;
 
+	/**
+	 * User key eRekam Medis dari BPJS
+	 *
+	 * @default process.env.JKN_REKAM_MEDIS_USER_KEY
+	 */
+	rekamMedisUserKey: string;
+
 	/**
 	 * Berupa mode "development" dan "production". Secara default akan
 	 * membaca nilai environment variable NODE_ENV atau "development"
@@ -122,6 +137,7 @@ export type SendResponse<T> = {
 	apotek: CamelResponse<T>;
 	pcare: CamelResponse<T>;
 	icare: CamelResponse<T, number>;
+	rekamMedis: LowerResponse<T>;
 };
 
 const api_base_urls: Record<Type, Record<Mode, string>> = {
@@ -144,6 +160,10 @@ const api_base_urls: Record<Type, Record<Mode, string>> = {
 	icare: {
 		development: 'https://apijkn-dev.bpjs-kesehatan.go.id/ihs_dev',
 		production: 'https://apijkn.bpjs-kesehatan.go.id/wsihs'
+	},
+	rekamMedis: {
+		development: 'https://apijkn-dev.bpjs-kesehatan.go.id/erekammedis_dev',
+		production: 'https://apijkn.bpjs-kesehatan.go.id/erekammedis'
 	}
 };
 
@@ -152,6 +172,7 @@ export class Fetcher {
 
 	private config: Config = {
 		mode: process.env.NODE_ENV !== 'production' ? 'development' : process.env.NODE_ENV,
+		ppkCode: process.env.JKN_PPK_CODE ?? '',
 		consId: process.env.JKN_CONS_ID ?? '',
 		consSecret: process.env.JKN_CONS_SECRET ?? '',
 		vclaimUserKey: process.env.JKN_VCLAIM_USER_KEY ?? '',
@@ -159,6 +180,7 @@ export class Fetcher {
 		apotekUserKey: process.env.JKN_APOTEK_USER_KEY ?? '',
 		pcareUserKey: process.env.JKN_PCARE_USER_KEY ?? '',
 		icareUserKey: process.env.JKN_ICARE_USER_KEY ?? '',
+		rekamMedisUserKey: process.env.JKN_REKAM_MEDIS_USER_KEY ?? '',
 		throw: false
 	};
 
@@ -193,7 +215,8 @@ export class Fetcher {
 			antrean: this.config.antreanUserKey,
 			apotek: this.config.apotekUserKey,
 			pcare: this.config.pcareUserKey,
-			icare: this.config.icareUserKey
+			icare: this.config.icareUserKey,
+			rekamMedis: this.config.rekamMedisUserKey
 		};
 	}
 
@@ -297,4 +320,8 @@ export class Fetcher {
 		this.configured = false;
 		await this.applyConfig();
 	}
+
+	get configuration(): Config {
+		return this.config;
+	}
 }
diff --git a/src/index.ts b/src/index.ts
index 0904484..c0ae0ee 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,6 +4,7 @@ import { CachedApi } from './base.js';
 import { Fetcher } from './fetcher.js';
 import { ICare } from './icare.js';
 import { PCare } from './pcare/index.js';
+import { RekamMedis } from './rekam-medis/index.js';
 import { VClaim } from './vclaim/index.js';
 
 type JKNResponseType<T extends object, K extends keyof T> = NonNullable<
@@ -37,6 +38,10 @@ export default class JKN extends Fetcher {
 	get icare(): ICare {
 		return this.cache.get('icare', ICare);
 	}
+
+	get rekamMedis(): RekamMedis {
+		return this.cache.get('rekamMedis', RekamMedis);
+	}
 }
 
 export type AntreanResponse<K extends keyof Antrean> = JKNResponseType<Antrean, K>;
diff --git a/src/rekam-medis/index.ts b/src/rekam-medis/index.ts
new file mode 100644
index 0000000..a90698a
--- /dev/null
+++ b/src/rekam-medis/index.ts
@@ -0,0 +1,64 @@
+import { BaseApi } from '../base.js';
+import { Config } from '../fetcher.js';
+import { RekamMedisFormat } from './types.js';
+import { encrypt, gzip } from './utils.js';
+
+export class RekamMedis extends BaseApi<'rekamMedis'> {
+	protected type = 'rekamMedis' as const;
+
+	async insert(data: {
+		/** nomor SEP */
+		nomorSEP: string;
+
+		/** jenis pelayanan (1 = Rawat Inap) (2 = Rawat Jalan) */
+		jenisPelayanan: string;
+
+		/** bulan penerbitan SEP (1 sampai 12) */
+		bulan: number;
+
+		/** tahun penerbitan SEP misal 2023 */
+		tahun: number;
+
+		/**
+		 * data rekam medis berupa plain object
+		 *
+		 * Proses kompresi dan enkripsi akan dilakukan
+		 * secara otomatis pada method ini
+		 */
+		dataRekamMedis: RekamMedisFormat;
+	}) {
+		const dataMR = await preprocess(data.dataRekamMedis, this.config);
+		return this.send({
+			path: `/`,
+			method: 'POST',
+			skipContentTypeHack: true,
+			headers: { 'Content-Type': 'text/plain' },
+			data: {
+				request: {
+					noSep: data.nomorSEP,
+					jnsPelayanan: data.jenisPelayanan,
+					bulan: String(data.bulan),
+					tahun: String(data.tahun),
+					dataMR
+				}
+			}
+		});
+	}
+}
+
+/**
+ * Pengolahan data berupa compression menggunakan metode GZIP
+ * and encryption dengan key berupa kombinasi CONS ID, SECRET KEY,
+ * dan KODE PPK. Ini berdasarkan spesifikasi yang telah ditentukan
+ * pada halaman TrustMark BPJS Kesehatan.
+ */
+async function preprocess(data: unknown, config: Config): Promise<string> {
+	try {
+		const value = JSON.stringify(data);
+		const compressed = await gzip(value);
+		return encrypt(compressed.toString(), config);
+	} catch (err) {
+		// TODO: define custom error
+		throw new Error(`failed to compress or encrypt data. ${err}`);
+	}
+}
diff --git a/src/rekam-medis/types.ts b/src/rekam-medis/types.ts
new file mode 100644
index 0000000..b66f35a
--- /dev/null
+++ b/src/rekam-medis/types.ts
@@ -0,0 +1,36 @@
+export interface Bundle<T = fhir4.FhirResource> extends fhir4.Bundle<T> {}
+
+export interface Composition extends fhir4.Composition {}
+
+export interface Patient extends fhir4.Patient {}
+
+export interface Encounter extends fhir4.Encounter {
+	subject?: fhir4.Encounter['subject'] & { noSep: string };
+}
+
+export interface MedicationRequest extends fhir4.MedicationRequest {}
+
+export interface Practitioner extends fhir4.Practitioner {}
+
+export interface Organization extends fhir4.Organization {}
+
+export interface Condition extends fhir4.Condition {}
+
+export interface DiagnosticReport extends fhir4.DiagnosticReport {}
+
+export interface Procedure extends fhir4.Procedure {}
+
+export interface Device extends fhir4.Device {}
+
+export type RekamMedisFormat =
+	| Bundle
+	| Composition
+	| Patient
+	| Encounter
+	| MedicationRequest
+	| Practitioner
+	| Organization
+	| Condition
+	| DiagnosticReport
+	| Procedure
+	| Device;
diff --git a/src/rekam-medis/utils.ts b/src/rekam-medis/utils.ts
new file mode 100644
index 0000000..6505352
--- /dev/null
+++ b/src/rekam-medis/utils.ts
@@ -0,0 +1,27 @@
+import zlib from 'node:zlib';
+import { Config } from '../fetcher.js';
+import { createCipheriv, createHash } from 'node:crypto';
+
+export async function gzip(value: string): Promise<Buffer> {
+	return new Promise((resolve, reject) => {
+		zlib.gzip(Buffer.from(value), (err, buf) => {
+			if (err) reject(err);
+			else resolve(buf);
+		});
+	});
+}
+
+export function encrypt(value: string, config: Config): string {
+	const { consId, consSecret, ppkCode } = config;
+	if (!consId || !consSecret || !ppkCode) {
+		throw new Error(`consId, consSecret, or ppkCode are not set`);
+	}
+
+	const keyPlain = consId + consSecret + ppkCode;
+	const key = createHash('sha256').update(keyPlain, 'utf8').digest();
+	const iv = Uint8Array.from(key.subarray(0, 16));
+	const cipher = createCipheriv('aes-256-cbc', key, iv);
+	let enc = cipher.update(value, 'base64', 'utf8');
+	enc += cipher.final('utf8');
+	return enc;
+}
diff --git a/words.txt b/words.txt
index ce21b0b..a53c6fc 100644
--- a/words.txt
+++ b/words.txt
@@ -21,12 +21,14 @@ diagppk
 dinsos
 dpho
 dpjp
+enkripsi
 estimasidilayani
 faskes
 FASKESASAL
 faskesasalresep
 faskesterdaftar
 fdate
+FHIR
 FKRTL
 FKTP
 flaginternal